SCHEDULE 14A INFORMATION

           Proxy Statement Pursuant to Section 14(a) of the Securities
                      Exchange Act of 1934 (Amendment No. )

                           Filed by the Registrant (X)
                 Filed by a Party other than the Registrant ( )

                           Check the appropriate box:

                ( )  Preliminary Proxy Statement
                ( )  Confidential, for Use of the Commission Only (as permitted
                     by Rule 14a-6(e)(2))
                ( )  Definitive Proxy Statement
                (X)  Definitive Additional Materials
                ( )  Soliciting Material Pursuant to Section 240.14a-11(c) or
                     Section 240.14a-12

                              DIOMED HOLDINGS, INC.
                (Name of Registrant as Specified in its Charter)

(Name of Person(s) Filing Proxy Statement, if other than Registrant)

Payment of Filing Fee (Check the appropriate box):

(X) No fee required

( ) Fee computed on table below per Exchange Act Rules 14a-6(i)(1) and 0-11.

       1) Title of each class of securities to which transaction applies:

       2) Aggregate number of securities to which transaction applies:

       3) Per unit  price  or other  underlying  value of  transaction  computed
       pursuant  to  Exchange  Act Rule 0-11 (Set  forth the amount on which the
       filing fee is calculated and state how it was determined):

       4) Proposed maximum aggregate value of transaction:

       5) Total fee paid:

       ( ) Fee paid previously with preliminary materials.

       ( ) Check box if any part of the fee is offset as  provided  by  Exchange
       Act Rule  0-11(a)(2) and identify the filing for which the offsetting fee
       was  paid  previously.  Identify  the  previous  filing  by  registration
       statement number, or the Form or Schedule and the date of its filing.

       1) Amount Previously Paid:

       2) Form, Schedule, or Registration Statement No.:

       3) Filing Party:

       4) Date Filed:



                              [COMPANY LETTERHEAD]



                                                               November 13, 2003

Dear Stockholder:

                             YOUR VOTE IS IMPORTANT!

By now you should have received the proxy statement that we recently distributed
to our stockholders in connection with the important  upcoming Annual Meeting of
Stockholders of Diomed  Holdings,  Inc., to be held on November 25, 2003. As the
Company has more than 5,000  beneficial  stockholders,  your vote is  important,
regardless of your share position. Please vote TODAY if you have not yet voted.

As stated in our proxy statement, the Company needs to obtain investment capital
to continue operating and to make necessary  investments in its growth strategy.
The board of directors  authorized the Company to enter into an equity financing
transaction to accomplish this goal. If the Company does not complete the equity
financing  transaction,  the  Company  will be  required  to cease or reduce its
operations,  sell the Company or enter into a business  combination with a third
party.

If the  stockholders do not approve  Proposal 3, Proposal 4 and Proposal 5, then
the Company will not be able to complete the equity financing. If the Company is
not able to complete the equity financing, the Company will not have the capital
it requires to continue its operations after December 31, 2003.

Please refer to the proxy  statement for detailed  information  regarding  these
proposals  and the other  proposals  to be voted on by our  stockholders  at the
Annual Meeting. For your ease of reference, the proxy statement can be viewed at
our website, www.diomedinc.com.

If you have not yet voted,  please vote TODAY by telephone,  by Internet,  or by
signing and  returning  the enclosed  voting form in the  postage-paid  envelope
provided.

Thank you for your continued support.

Sincerely,



Lisa M. Bruneau
Corporate Secretary

================================================================================


                                 IMPORTANT NOTE:

               Remember, you may vote by telephone or Internet --
               Simply follow the easy instructions on the enclosed
                                  voting form.

                If you have any questions, or need assistance in
                    voting your shares, please call our proxy
                                   solicitor:

                           INNISFREE M&A INCORPORATED
                           TOLL-FREE at 1-877-825-8619


================================================================================