Document:

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                                                                     EXHIBIT 4.2

                               AstroPower, Inc.

                     (Amendment of 1999 Stock Option Plan)

     I, THOMAS J. STINER, Secretary of AstroPower, Inc., a Delaware corporation
(the "Company"),

     DO HEREBY CERTIFY that:
               By resolution adopted by the Company's Board of Directors at a
          meeting held on March 17, 2000, and by resolution adopted by the
          affirmative vote of a majority in voting power of the shares of common
          stock present in person or by proxy entitled to vote at the Company's
          Annual Meeting of Shareholders held on June 15, 2000, the Company's
          1999 Stock Option Plan was amended to read as follows:

          "Section 5.  Stock.

          The total number of shares of Common Stock that may be issued or
          transferred under the Plan pursuant to Options granted thereunder may
          not exceed 1,100,000 shares (subject to adjustment as described
          below)."

     WITNESS, my hand and the seal of the Company the 15th day of June, 2000.

[SEAL]

                                                          s/ Thomas J. Stiner
                                                        ----------------------
                                                               Secretary

                                       2<PAGE>

                                                                     EXHIBIT 4.4

                     NON-QUALIFIED STOCK OPTION AGREEMENT

1.       Grant of Option.
         ---------------

    AstroPower, Inc., a Delaware corporation (the "Company"), hereby
                        grants to Allen M. Barnett (the "President"), an option,
                        to purchase an aggregate of 90,000 shares of Common
                        Stock, $.01 par value ("Common Stock"), of the Company
                        at a price of $12.13 per share, purchasable as set forth
                        in and subject to the terms and conditions of this
                        option. Except where the context otherwise requires, the
                        term "Company" shall include the parent and all
                        subsidiaries of the Company as defined in Sections
                        425(e) and 425(f) of the Internal Revenue Code of 1986,
                        as amended (the "Code").

2.       Non-qualified Stock Option.
         --------------------------

     This option is not intended to qualify as an incentive stock option within
                           the meaning of Section 422A of the Code.

3.       Exercise of Option and Provisions for Termination.
         -------------------------------------------------

         (a)   Vesting Schedule

Except as otherwise provided in this Agreement, this option may be exercised
       prior to the tenth Anniversary of the date of grant (hereinafter the
       "Expiration Date") in installments as to not more than the number of
       shares and during the respective installment periods set forth in the
       table below. The right of exercise shall be cumulative so that if the
       option is not exercised to the maximum extent permissible during any
       exercise period, it shall be exercisable, in whole or in part, with
       respect to all shares not so purchased at any time prior to the
       Expiration Date or the earlier termination of this option.

                  Vesting Period                     Total No. of Shares

                  On or after 12/6/99
                  But prior to 12/6/00                        22,500

                  On or after 12/6/00
                  But prior to 12/6/01                        22,500

                  On or after 12/6/01
                  But prior to 12/6/02                        22,500

                  On or after 12/6/03                         22,500
                                       3
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                  This option may not be exercised at any time on or after the
Expiration Date.

          (b)      Exercise Procedure.
                   ------------------

Subject  to the conditions set forth in this Agreement, this option shall be
         exercised by the Director's delivery of written notice of exercise to
         the Treasurer of the Company, specifying the number of shares to be
         purchased and the purchase price to be paid therefore and accompanied
         by payment in full in accordance with Section 4. Such exercise shall be
         effective upon receipt by the Treasurer of the Company of such written
         notice together with the required payment. The Director may purchase
         less than the number of shares covered hereby, provided that no partial
         exercise of this option may be for any fractional share or for fewer
         than ten whole shares.

          (c)      Exercise Period Upon Death or Disability.
                   ----------------------------------------

                   If the Director dies or becomes disabled (with the meaning of
                   Section 22(e)(3) of the Code or any successor provision
                   thereto), this option shall be exercisable, within the period
                   of one year following the date of death or disability of the
                   Director (but in no event after the Expiration Date), by the
                   Director or by the person to whom this option is transferred
                   by will or the laws of descent and distribution, provided
                                                                    --------
                   that this option shall be exercisable only to the extent that
                   ----
                   this option was exercisable by the Director on the date of
                   his or her death or disability. Except as otherwise indicated
                   by the context, the term "Director", as used in this option,
                   shall be deemed to include the estate of the Director or any
                   person who acquires the right to exercise this option by
                   bequest or inheritance or otherwise by reason of the death of
                   the Director.

4.       Payment of Purchase Price.
         -------------------------

         Method of Payment.
         -----------------

         Payment of the purchase price for shares purchased upon exercise of
         this option shall be made by delivery to the Company of cash or a check
         to the order of the Company in the amount equal to the purchase price
         of such shares.

5.       Delivery of Shares; Compliance with Securities Laws, Etc.
         ---------------------------------------------------------

          (a)      General.
                   -------

                   The Company shall, upon payment of the option price for the
                   number of shares purchased and paid for, make prompt delivery
                   of such shares to the Director, provided that if any law or
                                                   -------- ----
                   regulation requires the Company to take any action with
                   respect to such shares before the issuance thereof, then the
                   date of delivery of such shares shall be extended for the
                   period necessary to complete such action.

          (b)      Listing, Qualification, Etc.
                   ---------------------------

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This option shall be subject to the requirement that, if at any time,
      counsel to the Company shall determine that the listing, registration or
      qualification of the shares subject hereto upon any securities exchange or
      under any state or federal law, or the consent or approval of any
      governmental or regulatory body, is necessary as a condition of, or in
      connection with, the issuance or purchase of shares hereunder, this option
      may not be exercised, in whole or in part, unless such listing,
      registration, qualification, consent or approval shall have been effected
      or obtained on conditions acceptable to the Board of Directors. Nothing
      herein shall be deemed to require the Company to apply for or to obtain
      such listing, registration or qualification.

6.       Nontransferability of Option.
         ----------------------------

    Except as provided in paragraph (c) of Section 3, this option is personal
           and no rights granted hereunder may be transferred, assigned, pledged
           or hypothecated in any way (whether by operation of law or otherwise)
           nor shall any such rights be subject to execution, attachment or
           similar process. Upon any attempt to transfer, assign, pledge,
           hypothecate or otherwise dispose of this option or of such rights
           contrary to the provisions hereof, or upon the levy of any attachment
           or similar process upon this option or such rights, this option and
           such rights shall, at the election of the Company, become null and
           void.

7.       Rights as a Shareholder.
         -----------------------

    The  Director shall have no rights as a shareholder with
           respect to any shares which may be purchased by exercise of this
           option unless and until a certificate representing such shares is
           duly issued and delivered to the Director. No adjustment shall be
           made for dividends or other rights for which the record date is prior
           to the date such stock certificate is issued.

8.       Adjustments.
         -----------

         (a)      General.
                  -------

If, as a result of a merger, consolidation, sale of all or
          substantially all of the assets of the Company, reorganization,
          recapitalization, reclassification, stock dividend, stock split,
          reverse stock split or other distribution with respect to the
          outstanding shares of Common Stock or other securities, the
          outstanding shares of Common Stock are increased or decreased, or are
          exchanged for a different number or kind of shares or other
          securities, or additional shares or new or different shares or other
          securities are distributed with respect to such shares of Common Stock
          or other securities, an appropriate and proportionate adjustment may
          be made in (i) the number and kind of shares or other securities
          subject to this option and (ii) the price for each share subject to
          this option, without changing the aggregate purchase price as to which
          this option remains exercisable.

                                       5
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         (b)      Authority to Make Adjustments.
                  -----------------------------

Adjustments under this Section 8 will be made by a Committee of the Board of
         Directors appointed by the Board of Directors, whose determination as
         to what adjustments, if any, will be made and the extent thereof will
         be final, binding and conclusive. No fractional shares will be issued
         pursuant to this option on account of any such adjustments.

         (c)      Limits on Adjustments.
                  ---------------------

No adjustment shall be made under this Section 9 which would, within the meaning
              of any applicable provision of the Code, constitute a
              modification, extension or renewal of this option or a grant of
              additional benefits to the Director.

9.       Mergers, Etc.
         -------------

    In the event of a consolidation or merger in which the Company is not the
                           surviving corporation, or which results in the
                           acquisition of substantially all of the Company's
                           outstanding Common Stock by a single person, entity
                           or group of persons or entities acting in concert, or
                           in the event of the sale or transfer of all or
                           substantially all of the assets of the Company, or in
                           the event of a reorganization or liquidation of the
                           Company, prior to the Expiration Date or termination
                           of this option, the Director shall, with respect to
                           this option or any unexercised portion hereof, be
                           entitled to the rights and benefits, and be subject
                           to the limitations, set forth in Section 10 of the
                           Plan.

10.      Change in Control
         -----------------

         Notwithstanding anything to the contrary herein, in the case of a
         Change in Control of the Company, this option granted shall terminate
         on the later of (i) ninety (90) days after the occurrence of such
         Change in Control, and (ii) seven (7) months following the date of
         grant of each such option, and an option holder shall have the right,
         commencing at least five (5) days prior to such Change in Control and
         subject to any other limitation on exercise of an option in effect on
         the date of exercise, to immediately exercise any option in full,
         without regard to any vesting limitations, to the extent it shall not
         have been previously exercised.

                                       6
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11.      Withholding Taxes.
         -----------------

         The Company's obligation to deliver shares upon the exercise of this
         option shall be subject to the Director's satisfaction of all
         applicable federal, state and local income tax withholding
         requirements.

12.      Investment Representation; Legend.
         ---------------------------------

         (a)      Representations.
                  ---------------

               (i.)    Any shares purchased upon exercise of this option be
                       acquired for the Director's account for investment only
                       and not with a view to, or for sale in connection with,
                       any distribution of the shares in violation of the
                       Securities Act of 1933 (the Securities Act") or any rule
                       or regulation under the Securities Act.

               (ii.)   The Director has had such opportunity as he or she has
                       deemed adequate to obtain from representatives of the
                       Company such information as is necessary to permit the
                       Director to evaluate the merits and risks of his or her
                       investment in the Company.

               (iii.)  The Director is able to bear the economic risk of holding
                       shares acquired pursuant to the exercise of this option
                       for an indefinite period.

               (iv.)   The Director understands that (A) the shares acquired
                       pursuant to the exercise of this option may not be
                       registered under the Securities Act and if not so
                       registered will be "restricted securities" within the
                       meaning of Rule 144 under the Securities Act; (B) such
                       shares cannot be sold, transferred or otherwise disposed
                       of unless they are subsequently registered under the
                       Securities Act or an exemption from registration is then
                       available; (C) in any event, the exemption from
                       registration under Rule 144 will not be available for at
                       least one year from the date of exercise of the option
                       and even then will not be available unless a public
                       market then exists for the Common Stock, adequate
                       information concerning the Company is then available to
                       the public and other terms and conditions of Rule 144 are
                       complied with.

By making payment upon exercise of this option, the Director shall be deemed to
have reaffirmed, as of the date of such payment, the representations made in
this Section 12.

     (b)      Legend on Stock Certificates

              All stock certificates representing share of Common Stock issued
              to the Director upon exercise of this option which are not
              registered under the Securities Act shall have affixed thereto a
              legend substantially in the following form, in addition to any
              other legends required by applicable state law:

"The shares of stock represented by this certificate have not been registered
under the Securities

                                       7
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                     Act of 1933 and may not be transferred, sold or otherwise
                     disposed of in the absence of an effective registration
                     statement with respect to the shares evidenced by this
                     certificate, filed and made effective under the Securities
                     Act of 1933, or an opinion of counsel satisfactory to the
                     Company, to the effect that registration under such Act is
                     not required".

13.      Miscellaneous.
         -------------

         (a)      Except as provided herein, this option may not be amended or
                  otherwise modified unless evidenced in writing and signed by
                  the Company and the President.

         (b)      All notices under this option shall be mailed or delivered by
                  hand to the parties at their respective addresses set forth
                  beneath their names below or at such other address as may be
                  designated in writing by either of the parties to one another.

         (c)      This option shall be governed by and construed in accordance
                   with the laws of the State of Delaware.

                              AstroPower, Inc.

                              By:  /s/ Thomas J. Stiner
                              ----------------------------------------------
                                Sr. Vice President and Chief Financial Officer

                                       8
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                                  ACCEPTANCE

The undersigned hereby accepts the foregoing option and agrees to the terms and
conditions thereof.

/s/ Allen M. Barnett                        Address:    _____________________
------------------------------------
      Signature                                     ___________________________

-----------------------------------                 ___________________________
        Date
                                                    ___________________________

------------------------------------------------------------------------------
Date of Grant:             12/6/99
Name:                      Allen M. Barnett
Shares Granted:            90,000
------------------------------------------------------------------------------

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