Exhibit 4.2


NEITHER THIS DEBENTURE NOR THE SECURITIES INTO WHICH THIS DEBENTURE IS
CONVERTIBLE HAVE BEEN REGISTERED WITH THE SECURITIES AND EXCHANGE COMMISSION OR
THE SECURITIES COMMISSION OF ANY STATE IN RELIANCE UPON AN EXEMPTION FROM
REGISTRATION UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES
ACT"), AND, ACCORDINGLY, MAY NOT BE OFFERED OR SOLD EXCEPT PURSUANT TO AN
EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT OR PURSUANT TO AN
AVAILABLE EXEMPTION FROM, OR IN A TRANSACTION NOT SUBJECT TO, THE REGISTRATION
REQUIREMENTS OF THE SECURITIES ACT AND IN ACCORDANCE WITH APPLICABLE STATE
SECURITIES LAWS.

                                                               [$MONTHLY AMOUNT]
                                                                        NO. ____

                           PREMIER LASER SYSTEMS, INC.
                              CONVERTIBLE DEBENTURE

         FOR VALUE RECEIVED, Premier Laser Systems, Inc., a California
corporation, having a principal place of business at 3 Morgan, Irvine,
California 92618 (the "COMPANY") promises to pay to [CREDITOR], a [STATE OF
INCORPORATION] corporation (the"HOLDER"), the principal sum of [MONTHLY AMOUNT]
on ________________ (the "MATURITY DATE"). The Company shall not be required to
pay interest to the Holder on such principal sum. This Debenture is one of
[REQUIRED NUMBER] debentures in the aggregate amount of [TOTAL AMOUNT]
(hereinafter collectively or individually the "DEBENTURES").

         This Debenture is subject to the following additional provisions:

         SECTION 1. This Debenture is exchangeable for an equal aggregate
principal amount of Debentures of different authorized denominations, as
requested by the Holder surrendering the same. No service charge will be made
for such registration of transfer or exchange.

         SECTION 2. This Debenture has been issued subject to certain investment
representations of the Holder set forth in a separate agreement being entered
into concurrently with this Debenture, and may be transferred or exchanged only
in compliance with applicable securities laws. Prior to due presentment to the
Company for transfer of this Debenture, the Company and any agent of the Company
may treat the Person (as defined in Section 7) in whose name this Debenture is
duly registered on the Company's books as the owner hereof for the purpose of
receiving payment as herein provided and for all other purposes, whether or not
this Debenture is overdue, and neither the Company nor any such agent shall be
affected by notice to the contrary.

         Section 3. EVENTS OF DEFAULT.

                  (a) "EVENT OF DEFAULT", wherever used herein, means any one of
         the following events (whatever the reason and whether it shall be
         voluntary or involuntary or effected by operation of law or pursuant to
         any judgment, decree or order of any court, or any order, rule or
         regulation of any administrative or governmental body):



                           (i) any default in the payment of the principal of
                  any Debentures issued to Holder or in the performance of any
                  other debentures issued to any other creditor of the Company,
                  free of any claim of subordination, as and when the same shall
                  become due and payable (whether on the Maturity Date or by
                  acceleration or otherwise);

                           (ii) the Company shall fail to observe or perform any
                  other covenant, agreement or warranty contained in, or
                  otherwise commit any breach of any of, this Debenture, and
                  unless otherwise provided herein such failure or breach shall
                  not have been remedied within 10 days after the date on which
                  notice of such failure or breach shall have been given;

                           (iii) the Company or any of its subsidiaries (for
                  purposes of this subsection (iii), "subsidiary" shall mean a
                  subsidiary of the Company representing 5% or more of the
                  consolidated revenues of the Company and its consolidated
                  subsidiaries for the last fiscal year of the Company prior to
                  any of the events contemplated in this paragraph) shall
                  commence, or there shall be commenced against the Company or
                  any such subsidiary a case under any applicable bankruptcy or
                  insolvency laws as now or hereafter in effect or any successor
                  thereto, or the Company commences any other proceeding under
                  any reorganization, arrangement, adjustment of debt, relief of
                  debtors, dissolution, insolvency or liquidation or similar law
                  of any jurisdiction whether now or hereafter in effect
                  relating to the Company or any subsidiary thereof or there is
                  commenced against the Company or any subsidiary thereof any
                  such bankruptcy, insolvency or other proceeding which remains
                  undismissed for a period of 60 days; or the Company or any
                  subsidiary thereof is adjudicated insolvent or bankrupt; or
                  any order of relief or other order approving any such case or
                  proceeding is entered; or the Company or any subsidiary
                  thereof suffers any appointment of any custodian or the like
                  for it or any substantial part of its property which continues
                  undischarged or unstayed for a period of 60 days; or the
                  Company or any subsidiary thereof makes a general assignment
                  for the benefit of creditors; or the Company shall fail to
                  pay, or shall state that it is unable to pay, or shall be
                  unable to pay, its debts generally as they become due; or the
                  Company or any subsidiary thereof shall call a meeting of its
                  creditors with a view to arranging a composition, adjustment
                  or restructuring of its debts; or the Company or any
                  subsidiary thereof shall by any act or failure to act
                  expressly indicate its consent to, approval of or acquiescence
                  in any of the foregoing; or any corporate or other action is
                  taken by the Company or any subsidiary thereof for the purpose
                  of effecting any of the foregoing;

                           (iv) the Common Stock shall be either delisted from
                  the NASDAQ or suspended from trading on the NASDAQ without
                  resuming trading and/or being relisted thereon or on a
                  Subsequent Market or having such suspension lifted for five
                  (5) consecutive Trading Days or eight (8) Trading Days in the
                  aggregate (which need not be consecutive days);

                           (v) the Company shall fail for any reason to deliver
                  certificates to a Holder prior to the twelfth (12th) day after
                  a Conversion Date pursuant to and in accordance with Section
                  4(b) or the Company shall provide notice to the Holder,

                                       -2-


                  including by way of public announcement, at any time, of its
                  intention not to comply with requests for conversions of any
                  Debentures in accordance with the terms hereof.

                  (b) If any Event of Default occurs and is continuing, the full
         principal amount of this Debenture (and, at the Holder's option, all
         other Debentures then held by such Holder), together with other amounts
         owing in respect thereof, to the date of acceleration shall become,
         immediately due and payable in cash. The aggregate amount payable upon
         an Event of Default shall be equal to the entire unpaid principal
         amount of this Debenture. The Holder need not provide and the Company
         hereby waives any presentment, demand, protest or other notice of any
         kind, and the Holder may immediately and without expiration of any
         grace period enforce any and all of its rights and remedies hereunder
         and all other remedies available to it under applicable law. Such
         declaration may be rescinded and annulled by Holder at any time prior
         to payment hereunder. No such rescission or annulment shall affect any
         subsequent Event of Default or impair any right consequent thereon.

                  (c) If the Company has not registered the resale by Holder of
         the Common Stock into which this Debenture is convertible under the
         Securities Act of 1933, as amended, on or prior to that date ninety
         (90) days from the date of this Debenture, the Holder will have the
         option to require the Company to immediately repay upon expiration of
         such ninety (90) day period or refusal of registration by the SEC,
         whichever is earlier, the outstanding principal balance of the
         Debentures in monthly installments. Such payments will be made monthly
         commencing March 6, 2000, with an initial payment of $120,000 and each
         subsequent monthly payment being $40,000.00, until the principal
         balance of the Debentures has been fully paid.

         SECTION 4. CONVERSION.

                  (a) (i) CONVERSION AT OPTION OF HOLDER. This Debenture shall
                  be convertible into shares of Common Stock at the option of
                  the Holder, in whole or in part at any time and from time to
                  time, after the Original Issue Date (subject to the
                  limitations on conversion set forth in Section 4(a)(ii)
                  hereof). The number of shares of Common Stock issuable upon a
                  conversion hereunder shall be determined by dividing the
                  outstanding principal amount of this Debenture to be
                  converted, by the Conversion Price. The Holder shall effect
                  conversions by surrendering the Debentures (or such portions
                  thereof) to be converted, together with the form of conversion
                  notice attached hereto as EXHIBIT A (a "CONVERSION NOTICE") to
                  the Company. Each Conversion Notice shall specify the
                  principal amount of Debentures to be converted and the date on
                  which such conversion is to be effected, which date may not be
                  prior to the date such Conversion Notice is deemed to have
                  been delivered hereunder (a "CONVERSION DATE"). If no
                  Conversion Date is specified in a Conversion Notice, the
                  Conversion Date shall be the date that such Conversion Notice
                  is deemed delivered hereunder. Subject to Section 4(b), each
                  Conversion Notice, once given, shall be irrevocable. If the
                  Holder is converting less than all of the principal amount
                  represented by the Debenture(s) tendered by the Holder with
                  the Conversion Notice, or if a conversion hereunder cannot be
                  effected in full for any reason, the Company shall honor such
                  conversion to the extent permissible hereunder and shall
                  promptly deliver to such Holder (in the manner and within the
                  time set forth in Section 4(b)) a new Debenture for such
                  principal amount as has not been converted.

                                       -3-


                           (ii)     CERTAIN CONVERSION RESTRICTIONS

                                    (A) If the Common Stock is then listed for
                           trading on the NASDAQ or the Nasdaq SmallCap Market
                           and the Company has not obtained the Shareholder
                           Approval (as defined below), then the Company may not
                           issue in excess of 3,319,281 shares of Common Stock
                           upon conversions of Debentures or as payment of
                           interest thereon in shares of Common Stock, which
                           number shall be subject to adjustment pursuant to
                           Sections 4(c)(ii), (iii), (v), (vi) and (x) (such
                           number of shares, the "ISSUABLE MAXIMUM"). The
                           Issuable Maximum equals 19.999% of the number of
                           shares of Common Stock outstanding immediately prior
                           to the issuance of this Debenture. If on any
                           Conversion Date (A) the Common Stock is listed for
                           trading on the NASDAQ or the Nasdaq SmallCap Market,
                           (B) the Conversion Price then in effect is such that
                           the aggregate number of shares of Common Stock that
                           would then be issuable upon conversion in full of all
                           then outstanding Debentures held by Holder, together
                           with any shares of Common Stock previously issued
                           upon conversion of Debentures would exceed the
                           Issuable Maximum, and (C) the Company shall not have
                           previously obtained any vote of shareholders that may
                           be required by the applicable rules and regulations
                           of the Nasdaq Stock Market (or any successor entity)
                           applicable to approve the issuance of shares of
                           Common Stock in excess of the Issuable Maximum
                           pursuant to the terms hereof (the "SHAREHOLDER
                           APPROVAL"), then the Company shall issue to the
                           Holder requesting a conversion a number of shares of
                           Common Stock equal to the Issuable Maximum and, with
                           respect to the remainder of the principal amount of
                           Debentures then held by such Holder for which a
                           conversion in accordance with the Conversion Price
                           would result in an issuance of shares of Common Stock
                           in excess of the Issuable Maximum (the "EXCESS
                           PRINCIPAL"), the converting Holder shall have the
                           option to require the Company to pay cash to the
                           converting Holder in an amount equal to the
                           Conversion Price for all shares of Common Stock
                           constituting the Excess Principal (the "MANDATORY
                           PREPAYMENT AMOUNT"). If the Company fails to pay the
                           Mandatory Prepayment Amount in full pursuant to this
                           Section, the Company will pay interest thereon at a
                           rate of 15% per annum to the converting Holder,
                           accruing daily from the Conversion Date until such
                           amount, plus all such interest thereon, is paid in
                           full.

                                       -4-


                  (b)      (i) Not later than three (3) Trading Days after
                  any Conversion Date, the Company will deliver to the Holder
                  (i) a certificate or certificates which shall be free of
                  restrictive legends and trading restrictions (other than those
                  required under applicable securities laws) representing the
                  number of shares of Common Stock being acquired upon the
                  conversion of Debentures (subject to the limitations set forth
                  in Section 4(a)(ii) hereof), and (ii) Debentures in a
                  principal amount equal to the principal amount of Debentures
                  not converted; PROVIDED, that the Company shall not be
                  obligated to issue certificates evidencing the shares of
                  Common Stock issuable upon conversion of the principal amount
                  of Debentures until Debentures are delivered for conversion to
                  the Company, or the Holder notifies the Company that such
                  Debentures have been lost, stolen or destroyed and provides a
                  bond (or other adequate security) reasonably satisfactory to
                  the Company to indemnify the Company from any loss incurred by
                  it in connection therewith. The Company shall, upon request of
                  the Holder, if available, use its best efforts to deliver any
                  certificate or certificates required to be delivered by the
                  Company under this Section electronically through the
                  Depository Trust Corporation or another established clearing
                  corporation performing similar functions. If in the case of
                  any Conversion Notice such certificate or certificates are not
                  delivered to or as directed by the applicable Holder by the
                  third (3rd) Trading Day after the Conversion Date, the Holder
                  shall be entitled by written notice to the Company at any time
                  on or before its receipt of such certificate or certificates
                  thereafter, to rescind such conversion, in which event the
                  Company shall immediately return the certificates representing
                  the principal amount of Debentures tendered for conversion.

                           (ii) If the Company fails to deliver to the Holder
                  such certificate or certificates pursuant to Section 4(b)(i),
                  by the third (3rd) Trading Day after the Conversion Date, the
                  Company shall pay to such Holder, in cash, as liquidated
                  damages and not as a penalty, $1,000 for each Trading Day
                  after such third (3rd) Trading Day until such certificates are
                  delivered. Nothing herein shall limit a Holder's right to
                  pursue actual damages for the Company's failure to deliver
                  certificates representing shares of Common Stock upon
                  conversion within the period specified herein and such Holder
                  shall have the right to pursue all remedies available to it at
                  law or in equity including, without limitation, a decree of
                  specific performance and/or injunctive relief. The exercise of
                  any such rights shall not prohibit the Holders from seeking to
                  enforce damages pursuant to any other Section hereof or under
                  applicable law. Further, if the Company shall not have
                  delivered any cash due in respect of conversions of Debentures
                  by the third (3rd) Trading Day after the Conversion Date, the
                  Holder may, by notice to the Company, require the Company to
                  issue shares of Common Stock pursuant to Section 4(c), except
                  that for such purpose the Conversion Price applicable thereto
                  shall be the lesser of the Conversion Price on the Conversion
                  Date and the Conversion Price on the date of such Holder
                  demand. Any such shares will be subject to the provision of
                  this Section.

                           (iii) In addition to any other rights available to
                  the Holder, if the Company fails to deliver to the Holder such
                  certificate or certificates pursuant to Section 4(b)(i), by
                  the third (3rd) Trading Day after the Conversion Date, and if
                  after such third (3rd) Trading Day the Holder purchases (in an
                  open market transaction or otherwise) Common Stock to deliver
                  in satisfaction of a sale by such Holder of the Underlying
                  Shares which the Holder anticipated receiving upon such
                  conversion (a "BUY-IN"), then the Company shall (A) pay in
                  cash to the Holder (in addition to any remedies available to
                  or elected by the Holder) the amount by which (x) the Holder's

                                       -5-


                  total purchase price (including brokerage commissions, if any)
                  for the Common Stock so purchased exceeds (y) the product of
                  (1) the aggregate number of shares of Common Stock that such
                  Holder anticipated receiving from the conversion at issue
                  multiplied by (2) the market price of the Common Stock at the
                  time of the sale giving rise to such purchase obligation and
                  (B) at the option of the Holder, either reissue Debentures in
                  principal amount equal the principal amount of the attempted
                  conversion or deliver to the Holder the number of shares of
                  Common Stock that would have been issued had the Company
                  timely complied with its delivery requirements under Section
                  4(b)(i). For example, if the Holder purchases Common Stock
                  having a total purchase price of $11,000 to cover a Buy-In
                  with respect to an attempted conversion of Debentures with
                  respect to which the market price of the Underlying Shares on
                  the date of conversion was a total of $10,000 under clause (A)
                  of the immediately preceding sentence, the Company shall be
                  required to pay the Holder $1,000. The Holder shall provide
                  the Company written notice indicating the amounts payable to
                  the Holder in respect of the Buy-In. Notwithstanding anything
                  contained herein to the contrary, if a Holder requires the
                  Company to make payment in respect of a Buy-In for the failure
                  to timely deliver certificates hereunder and the Company
                  timely pays in full such payment, the Company shall not be
                  required to pay such Holder liquidated damages under Section
                  4(b)(ii) in respect of the certificates resulting in such
                  Buy-In.

                  (c)      (i) The conversion price (the "CONVERSION PRICE") in
                  effect on any Conversion Date shall be the closing sale price
                  of the Common Stock on the Conversion Date which must be a
                  Trading Day. Notwithstanding the foregoing, the Conversion
                  Price shall not be less than the Floor (as defined in Section
                  7) for so long as the Floor remains in effect in accordance
                  with Section 6; PROVIDED, that the Floor shall be subject to
                  reduction due to operation of this Section 4(c).

                           (ii) In case of any reclassification of the Common
                  Stock or any compulsory share exchange pursuant to which the
                  Common Stock is converted into other securities, cash or
                  property, the Holders shall have the right thereafter to, at
                  their option, (A) convert the then outstanding principal
                  amount only into the shares of stock and other securities,
                  cash and property receivable upon or deemed to be held by
                  holders of the Common Stock following such reclassification or
                  share exchange, and the Holders of the Debentures shall be
                  entitled upon such event to receive such amount of securities,
                  cash or property as the shares of the Common Stock of the
                  Company into which the then outstanding principal amount could
                  have been converted immediately prior to such reclassification
                  or share exchange would have been entitled or (B) require the
                  Company to prepay the aggregate of its outstanding principal
                  amount of Debentures. The entire prepayment price shall be
                  paid in cash. This provision shall similarly apply to
                  successive reclassifications or share exchanges.

                           (iii) All calculations under this Section 4 shall be
                  made to the nearest cent or the nearest 1/100th of a share, as
                  the case may be.

                                       -6-


                           (iv) If (A) the Company shall declare a special
                  nonrecurring cash dividend on or a redemption of the Common
                  Stock; (B) the Company shall authorize the granting to all
                  holders of the Common Stock rights or warrants to subscribe
                  for or purchase any shares of capital stock of any class or of
                  any rights; (C) the approval of any stockholders of the
                  Company shall be required in connection with any
                  reclassification of the Common Stock, any consolidation or
                  merger to which the Company is a party, any sale or transfer
                  of all or substantially all of the assets of the Company, of
                  any compulsory share exchange whereby the Common Stock is
                  converted into other securities, cash or property; (D) the
                  Company shall authorize the voluntary or involuntary
                  dissolution, liquidation or winding up of the affairs of the
                  Company; then, in each case, the Company shall give notice to
                  the Holders as provided in subsection (g) below at least 20
                  calendar days prior to the applicable record or effective date
                  hereinafter specified, a notice stating (x) the date on which
                  a record is to be taken for the purpose of such dividend,
                  distribution, redemption, rights or warrants, or if a record
                  is not to be taken, the date as of which the holders of the
                  Common Stock of record to be entitled to such dividend,
                  distributions, redemption, rights or warrants are to be
                  determined or (y) the date on which such reclassification,
                  consolidation, merger, sale, transfer or share exchange is
                  expected to become effective or close, and the date as of
                  which it is expected that holders of the Common Stock of
                  record shall be entitled to exchange their shares of the
                  Common Stock for securities, cash or other property
                  deliverable upon such reclassification, consolidation, merger,
                  sale, transfer or share exchange; PROVIDED, HOWEVER, that the
                  failure to mail such notice or any defect therein or in the
                  mailing thereof shall not affect the validity of the corporate
                  action required to be specified in such notice. The failure to
                  provide such notice shall constitute an Event of Default under
                  Section 3(a)(ii) above unless the Holder is otherwise provided
                  the opportunity, upon conversion, to receive the dividend,
                  redemption rights, subscription rights or warrants, voting or
                  approval rights, securities or other consideration that would
                  be payable or provided to Holder had Holder converted the
                  Debentures into Common Stock prior to the consummation of any
                  of the actions or events identified in clauses (A) through (D)
                  above. Holders are entitled to convert Debentures during the
                  20-day period commencing the date of such notice to the
                  effective date of the event triggering such notice.

                           (v) In case of any (1) merger or consolidation of the
                  Company with or into another Person that would constitute a
                  Change of Control Transaction, or (2) sale by the Company of
                  more than one-half of the assets of the Company (on an as
                  valued basis) in one or a series of related transactions, or
                  (3) tender or other offer or exchange (whether by the Company
                  or another Person) pursuant to which holders of Common Stock
                  are permitted to tender or exchange their shares for other
                  securities, stock, cash or property of the Company or another
                  Person; then a Holder shall have the right to (A) convert its
                  aggregate principal amount of Debentures then outstanding into
                  the shares of stock and other securities, cash and property
                  receivable upon or deemed to be held by holders of Common
                  Stock following such merger, consolidation or sale, and such
                  Holder shall be entitled upon such event or series of related
                  events to receive such amount of securities, cash and property
                  as the shares of Common Stock into which such aggregate

                                       -7-


                  principal amount of Debentures could have been converted
                  immediately prior to such merger, consolidation or sales would
                  have been entitled, (B) in the case of a merger or
                  consolidation, (x) require the surviving entity to issue
                  convertible debentures in a principal amount equal to the
                  aggregate principal amount of Debentures then held by such
                  Holder, which newly issued debentures shall have terms
                  identical (including with respect to conversion) to the terms
                  of this Debenture and shall be entitled to all of the rights
                  and privileges of a Holder of Debentures set forth herein, and
                  (y) simultaneously with the issuance of such convertible
                  debentures, shall have the right to convert such instrument
                  only into shares of stock and other securities, cash and
                  property receivable upon or deemed to be held by holders of
                  Common Stock following such merger or consolidation, or (C) in
                  the event of an exchange or tender offer or other transaction
                  contemplated by clause (3) of this Section, tender or exchange
                  its aggregate principal amount of Debentures for such
                  securities, stock, cash and other property receivable upon or
                  deemed to be held by holders of Common Stock that have
                  tendered or exchanged their shares of Common Stock following
                  such tender or exchange, and such Holder shall be entitled
                  upon such exchange or tender to receive such amount of
                  securities, cash and property as the shares of Common Stock
                  into which such aggregate principal amount of Debentures could
                  have been converted immediately prior to such tender or
                  exchange would have been entitled as would have been issued.
                  In the case of clause (B), the conversion price applicable for
                  the newly issued convertible debentures shall be based upon
                  the amount of securities, cash and property that each share of
                  Common Stock would receive in such transaction and the
                  Conversion Price in effect immediately prior to the
                  effectiveness or closing date for such transaction. The terms
                  of any such merger, sale, consolidation, tender or exchange
                  shall include such terms so as to continue to give the Holders
                  of Debentures the right to receive the securities, cash and
                  property set forth in this Section upon any conversion or
                  redemption following such event. This provision shall
                  similarly apply to successive such events.

                  (d) The Company covenants that it will at all times reserve
         and keep available out of its authorized and unissued shares of Common
         Stock solely for the purpose of issuance upon conversion of the
         Debentures, free from preemptive rights or any other actual contingent
         purchase rights of persons other than the Holders, not less than such
         number of shares of the Common Stock as shall be issuable (taking into
         account the adjustments and restrictions of Section 4(b)) upon the
         conversion of the outstanding principal amount of the Debentures and
         payment of interest hereunder. The Company covenants that all shares of
         Common Stock that shall be so issuable shall, upon issue, be duly and
         validly authorized, issued and fully paid, nonassessable and, if a
         Registration Statement has been declared effective under the Securities
         Act, registered for public sale in accordance with such Registration
         Statement.

                                       -8-


                  (e) Upon a conversion hereunder the Company shall not be
         required to issue stock certificates representing fractions of shares
         of the Common Stock, but may if otherwise permitted, make a cash
         payment in respect of any final fraction of a share based on the market
         value of a share of Common Stock at such time. If the Company elects
         not, or is unable, to make such a cash payment, the Holder shall be
         entitled to receive, in lieu of the final fraction of a share, one
         whole share of Common Stock.

                  (f) The issuance of certificates for shares of the Common
         Stock on conversion of the Debentures shall be made without charge to
         the Holders thereof for any documentary stamp or similar taxes that may
         be payable in respect of the issue or delivery of such certificate,
         provided that the Company shall not be required to pay any tax that may
         be payable in respect of any transfer involved in the issuance and
         delivery of any such certificate upon conversion in a name other than
         that of the Holder of such Debentures so converted and the Company
         shall not be required to issue or deliver such certificates unless or
         until the person or persons requesting the issuance thereof shall have
         paid to the Company the amount of such tax or shall have established to
         the satisfaction of the Company that such tax has been paid.

                  (g) Any and all notices or other communications or deliveries
         to be provided by the Holders of the Debentures hereunder, including,
         without limitation, any Conversion Notice, shall be in writing and
         delivered personally, by facsimile, sent by a nationally recognized
         overnight courier service or sent by certified or registered mail,
         postage prepaid, addressed to the Company, at 3 Morgan, Irvine,
         California 92618 (facsimile number (949) 859-5241), attention Chief
         Financial Officer, or such other address or facsimile number as the
         Company may specify for such purposes by notice to the Holders
         delivered in accordance with this Section, with a copy to Rutan &
         Tucker, LLP, 611 Anton Boulevard, Costa Mesa, CA 92626 (facsimile
         number (714) 546-9035), attention Thomas G. Brockington, Esq. Any and
         all notices or other communications or deliveries to be provided by the
         Company hereunder shall be in writing and delivered personally, by
         facsimile, sent by a nationally recognized overnight courier service or
         sent by certified or registered mail, postage prepaid, addressed to
         each Holder of the Debentures at the facsimile telephone number or
         address of such Holder appearing on the books of the Company, or if no
         such facsimile telephone number or address appears, at the principal
         place of business of the holder. Any notice or other communication or
         deliveries hereunder shall be deemed given and effective on the
         earliest of (i) the date of transmission, if such notice or
         communication is delivered via facsimile at the facsimile telephone
         number specified in this Section prior to 4:00 p.m. (California time),
         (ii) the date after the date of transmission, if such notice or
         communication is delivered via facsimile at the facsimile telephone
         number specified in this Section later than 4:00 p.m. (California time)
         on any date and earlier than 11:59 p.m. (California time) on such date,
         (iii) four days after deposit in the United States mail, (iv) the
         Business Day following the date of mailing, if sent by nationally
         recognized overnight courier service, or (v) upon actual receipt by the
         party to whom such notice is required to be given. The addresses and
         facsimile numbers for any notices or copies of notices required under
         this section (g) may be changed by a written notice conforming to the
         requirements of this subsection (g).

                                       -9-


         SECTION 5. OPTIONAL PREPAYMENT.

                  (a) The Company shall have the right, exercisable at any time
         and from time to time in accordance with the terms hereof, upon five
         (5) business day's notice to the Holder, to prepay all or any portion
         of the outstanding principal amount of this Debenture which have not
         previously been repaid or for which Conversion Notices have not
         previously been delivered. The prepayment price shall be paid in cash.
         Any such prepayment shall be free of any claim of subordination. The
         Holder shall have the right to tender, and the Company shall honor,
         Conversion Notices delivered prior to the expiration of such one day
         period.

         SECTION 6. MANDATORY PREPAYMENT/ELIMINATION OF FLOOR.

                  (a) If the Conversion Price for twenty-one (21) consecutive
         days shall be equal to or below $1.50, the Holder may, at any time
         thereafter, deliver a notice to the Company (the "HOLDER NOTICE")
         requiring the Company to act in accordance with the immediately
         following sentence. Within three (3) Business Days after delivery of
         the Holder Notice under this Section 6(a), the Company shall notify the
         Holder of its election to either (i) prepay the entire outstanding
         principal amount of the Debentures which have not previously been
         repaid or for which Conversion Notices have not previously been
         delivered no later than ten (10) Business Days from such election, or
         (ii) discontinue and remove permanently the Floor. The Company shall
         honor Conversion Notices delivered prior to the expiration of the three
         (3) Business Day period contemplated by this Section 6(a), provided,
         that such conversions shall be subject to the Floor. A failure of the
         Company to timely elect under this Section 6(a) shall be deemed an
         election to discontinue permanently the Floor.

          SECTION 7. DEFINITIONS. For the purposes hereof, the following
terms shall have the following meanings:

                  "BUSINESS DAY" means any day except Saturday, Sunday and any
         day which shall be a legal holiday or a day on which banking
         institutions in the State of California are authorized or required by
         law or other government action to close.

                  "CHANGE OF CONTROL TRANSACTION" means the occurrence of any of
         (i) an acquisition after the date hereof by an individual or legal
         entity or "group" (as described in Rule 3d-5(b)(1) promulgated under
         the Exchange Act) of in excess of 40% of the voting securities of the
         Company, (ii) a replacement of more than one-half of the members of the
         Company's board of directors which is not approved by those individuals
         who are members of the board of directors on the date hereof in one or
         a series of related transactions, (iii) the merger of the Company with
         or into another entity, consolidation or sale of all or substantially
         all of the assets of the Company in one or a series of related
         transactions, unless following such transaction, the holders of the
         Company's securities continue to hold at least 60% of such securities
         following such transaction or (iv) the execution by the Company of an
         agreement to which the Company is a party or by which it is bound,
         providing for any of the events set forth above in (i), (ii) or (iii).

                  "COMMISSION" means the Securities and Exchange Commission.

                                      -10-


                  "COMMON STOCK" means the Class A Common Stock, no par value
         per share, of the Company and stock of any other class into which such
         shares may hereafter have been reclassified or changed.

                  "EXCHANGE ACT" means the Securities Exchange Act of 1934, as
         amended.

                  "FLOOR" means $1.50.

                  "ORIGINAL ISSUE DATE" shall mean the date of the first
         issuance of the Debentures regardless of the number of transfers of any
         Debenture and regardless of the number of instruments which may be
         issued to evidence such Debenture.

                  "PERSON" means a corporation, an association, a partnership,
         organization, a business, an individual, a government or political
         subdivision thereof or a governmental agency.

                  "SECURITIES ACT" means the Securities Act of 1933, as amended.

                  "TRADING DAY" means (a) a day on which the Common Stock is
         traded on the NASDAQ or on such Subsequent Market on which the Common
         Stock is then listed or quoted, or (b) if the Common Stock is not
         listed on the NASDAQ or a Subsequent Market, a day on which the Common
         Stock is traded in the over-the-counter market, as reported by the OTC
         Bulletin Board, or (c) if the Common Stock is not quoted on the OTC
         Bulletin Board, a day on which the Common Stock is quoted in the
         over-the-counter market as reported by the National Quotation Bureau
         Incorporated (or any similar organization or agency succeeding its
         functions of reporting prices); PROVIDED, HOWEVER, that in the event
         that the Common Stock is not listed or quoted as set forth in (a), (b)
         and (c) hereof, then Trading Day shall mean any day except Saturday,
         Sunday and any day which shall be a legal holiday or a day on which
         banking institutions in the State of New York are authorized or
         required by law or other government action to close.

                  "UNDERLYING SHARES" means the shares of Common Stock issuable
         upon conversion of Debentures.

         SECTION 8. Except as expressly provided herein, no provision of this
Debenture shall alter or impair the obligation of the Company, which is absolute
and unconditional, to pay the principal of this Debenture at the time, place,
and rate, and in the coin or currency, herein prescribed. This Debenture is a
direct obligation of the Company. This Debenture ranks PARI PASSU with all other
Debentures now or hereafter issued under the terms set forth herein. The Company
may only voluntarily prepay the outstanding principal amount on the Debentures
in accordance with Section 5 hereof.

                                      -11-


         SECTION 9. This Debenture shall not entitle the Holder to any of the
rights of a stockholder of the Company, including without limitation, the right
to vote, to receive dividends and other distributions, or to receive any notice
of, or to attend, meetings of stockholders or any other proceedings of the
Company, unless and to the extent converted into shares of Common Stock in
accordance with the terms hereof. The Company represents and warrants that the
issuance of the Debentures to Creditor is not now, and will not be in the
future, a fraudulent conveyance as defined by applicable law and that the
issuance of the Debentures will not otherwise give rise to a claim by any other
of the creditors of PSLI or affiliated entities to set aside and/or recover the
Debentures to the benefit of such creditors.

         SECTION 10. If this Debenture shall be mutilated, lost, stolen or
destroyed, the Company shall execute and deliver, in exchange and substitution
for and upon cancellation of a mutilated Debenture, or in lieu of or in
substitution for a lost, stolen or destroyed debenture, a new Debenture for the
principal amount of this Debenture so mutilated, lost, stolen or destroyed but
only upon receipt of evidence of such loss, theft or destruction of such
Debenture, and of the ownership hereof, and indemnity, if requested, all
reasonably satisfactory to the Company.

         SECTION 11. This Debenture shall be governed by and construed in
accordance with the laws of the State of California, without giving effect to
conflicts of laws thereof. The Company and the Holder hereby irrevocably submit
to the exclusive jurisdiction of the state and federal courts sitting in the
County of Orange, California for the adjudication of any dispute hereunder or in
connection herewith or with any transaction contemplated hereby or discussed
herein. Each of the Company and the Holder hereby irrevocably waives personal
service of process and consents to process being served in any such suit, action
or proceeding by receiving a copy thereof sent to the Company at the address in
effect for notices to it under this instrument and agrees that such service
shall constitute good and sufficient service of process and notice thereof.
Nothing contained herein shall be deemed to limit in any way any right to serve
process in any manner permitted by law.

         SECTION 12. Any waiver by the Company or the Holder of a breach of any
provision of this Debenture shall not operate as or be construed to be a waiver
of any other breach of such provision or of any breach of any other provision of
this Debenture. The failure of the Company or the Holder to insist upon strict
adherence to any term of this Debenture on one or more occasions shall not be
considered a waiver or deprive that party of the right thereafter to insist upon
strict adherence to that term or any other term of this Debenture. Any waiver
must be in writing.

         SECTION 13. If any provision of this Debenture is invalid, illegal or
unenforceable, the balance of this Debenture shall remain in effect, and if any
provision is inapplicable to any person or circumstance, it shall nevertheless
remain applicable to all other persons and circumstances.

         SECTION 14. Whenever any payment or other obligation hereunder shall be
due on a day other than a Business Day, such payment shall be made on the next
succeeding Business Day.

         SECTION 15. In the event either the Holder or Company commences
litigation to enforce the provisions of this Debenture, the prevailing party in
such litigation shall be entitled to be reimbursed for all of its reasonable
attorneys' fees and costs incurred in connection with such action.

                                      -12-


         IN WITNESS WHEREOF, the Company has caused this Debenture to be duly
executed by a duly authorized officer as of the date first above indicated.

                                       PREMIER LASER SYSTEMS, INC.


                                       By:__________________________________

                                       Name:________________________________

                                       Title:_______________________________

ATTEST:



By:__________________________________

Name:________________________________

Title:_______________________________




                                    EXHIBIT A

                              NOTICE OF CONVERSION


(To be Executed by the Registered Holder
in order to Convert the Debenture)

The undersigned hereby elects to convert the attached Debenture into shares of
Class A Common Stock, no par value per share (the "Common Stock"), of Premier
Laser Systems, Inc. (the "Company") according to the conditions hereof, as of
the date written below. If shares are to be issued in the name of a person other
than undersigned, the undersigned will pay all transfer taxes payable with
respect thereto and is delivering herewith such certificates and opinions as
reasonably requested by the Company in accordance therewith. No fee will be
charged to the holder for any conversion, except for such transfer taxes, if
any.


Conversion calculations:
                                  ______________________________________________
                                  Date to Effect Conversion


                                  ______________________________________________
                                  Principal Amount of Debentures to be Converted


                                  ______________________________________________
                                  Number of shares of Common Stock to be Issued


                                  ______________________________________________
                                  Applicable Conversion Price


                                  ______________________________________________
                                  DTC# (for electronic transfers)

                                  ______________________________________________
                                  Signature


                                  ______________________________________________
                                  Name


                                  ______________________________________________
                                  Address