Exhibit 10.15


April 18, 2007

Louis P. Nunes
32 Matchett Street
Boston, MA 02135

Dear Louis:

It is my pleasure to offer you the position of Chief  Financial  Officer  "CFO",
reporting to the CEO. In this position you will be  responsible  for the overall
financial  management of the company.  This will include managing all aspects of
accounting,   public  company  compliance,   analysis  and  strategic  financial
direction.  In addition to these tasks,  you will have other  general  duties as
assigned by your manager.

As we've  discussed,  this offer is  contingent  upon receipt of a  satisfactory
investigation report of your background, which you will be required to authorize
as a condition of your employment. This contingency is to be settled by no later
than May 30, 2007 or else you can assume we no longer need such  checking.  If a
background  check is  performed  by a third party you will receive a copy of the
report.

This letter and  accompanying  enclosures  will summarize  important  details of
matters pertaining to your employment.  Our benefits,  payroll,  and other human
resource  management  services  are  provided  through   Administaff,   Inc.,  a
professional employer organization.  Lightspace's current benefits are described
in  the  document  called   "Lightspace  2007  Benefits  Summary  for  Full-Time
Employees", a copy of which is enclosed. As a result of Lightspace's arrangement
with  Administaff,  Administaff  will be considered  your employer of record for
these  purposes and your  manager here at  Lightspace  will be  responsible  for
working with you in setting your  objectives and reviewing  your  performance at
Lightspace.

Compensation:  The  Company  offers you a base salary of  $10,416.67  per month,
$125,000.00  annualized.  The Company  will also  include you in the  management
bonus program.  This will be a discretionary  bonus plan that will be decided on
by the Board of Directors. As the CFO for Lightspace, you will also be a part of
the  Employee  Stock  Option  Plan.  You will be granted  the option to purchase
250,000 shares of Lightspace common stock. These options will vest annually over
a three year term.

Expenses.  The company will reimburse you for reasonable and necessary  expenses
incurred by you in furtherance of Lightspace's  business.  All expenses  claimed
are  subject to the review and  approval  of your  supervisor.  Records  must be
maintained  and  submitted  for  any  expenses  to  be  reimbursed  -  including
destination for auto mileage totals and receipts for all other items.

Company Property. During and after your employment, you will not use any Company
Property for any purpose  other than for the benefit of the Company.  Except for
business uses related to the  performance  of your job, you will not remove from
the  Company  premises  any Company  Property  without  written  consent of your
supervisor.  In the event of your  termination of employment,  or at any time at
the request of the Company, you will return all Company Property.  You will also
return all copies of Company Property, and any Work Product derived from Company
Property.




"Company  Property"  means Trade Secrets of Lightspace,  Work Product,  customer
lists,  prospect lists,  forms,  manuals,  records,  correspondence,  contracts,
notes, memoranda,  notebooks and other documents of the Company, software media,
equipment, and other intangible and tangible property owned by the Company.

Name & Likeness Rights, etc. You hereby authorize the Company to use, reuse, and
to grant  others  the right to use and reuse  your  name,  photograph,  likeness
(including   caricature),   voice,   and  biographical   information,   and  any
reproduction  or  simulation  thereof,  in any  media  now  known  or  hereafter
developed  (including  but not limited to film,  video,  and  digital,  or other
electronic media), both during and after your employment,  for whatever purposes
the Company deems necessary,  provided that after your employment it is not used
in a manner indicating you are still employed with the company.

Term of  Employment.  As  Lightspace  is the company for which you will  perform
service,  we will retain the right to control and direct your work, its results,
and the  manner and means by which your work is  accomplished.  Your  employment
with the Company is at will,  and  therefore,  may be  terminated  by you or the
Company  at any time and for any  reason,  with or  without  cause,  and with or
without notice.  This "at will"  employment  relationship may not be modified by
any oral or implied agreement.

Additional Benefits. As stated above, Lightspace has contracted with Administaff
to  provide  payroll,  benefits  and HR  administration  services  on  behalf of
Lightspace.  Information  about these  benefits is included with this letter and
additional  information will be available  on-line over the web on the terms and
conditions  included in the End User License  Agreement (EULA) each new employee
must accept in order to access Administaff's on-line self-service portal.

You may indicate  your  acceptance  of this offer by signing on the  appropriate
space indicated below.  Please bring the necessary  documents required to verify
your identity and eligibility to work in the United States. A list of acceptable
documents is described on the enclosed I-9 form.  Also,  if you have not already
done so, please  complete the enclosed  Application for Employment for our files
and submit it prior to your first day of work.  Finally,  as a condition of your
employment,  you  will be  required  to sign  our  Proprietary  Information  and
Inventions Agreement  (enclosed) as well as our standard  Arbitration  Agreement
(enclosed).

This offer is valid until April 27, 2007.  If not signed,  accepted and returned
to Lightspace by this date,  the offer is  automatically  withdrawn.  We further
understand that your start date will be April 30, 2007.

We are all excited about the  opportunity to work with you. On behalf of all our
team members, let me extend a sincere Welcome Aboard!

Sincerely,



Gary Florindo
President & CEO

Enclosures: delivered separately


I accept the above terms of employment as stated:


Signature:                                     Date:
          -------------------------------           ----------------------------

Louis Nunes