Document:

<PAGE>

                                                                    Exhibit 4.10

          THE SECURITIES REPRESENTED BY THIS WARRANT HAVE NOT BEEN REGISTERED
          UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE "ACT"), OR UNDER THE
          SECURITIES LAWS OF ANY JURISDICTION. THESE SECURITIES MAY NOT BE SOLD,
          HEDGED, TRANSFERRED, PLEDGED, OR ASSIGNED EXCEPT: (I) PURSUANT TO AN
          EFFECTIVE REGISTRATION UNDER THE ACT; OR (II) IF THE PROPOSED SALE,
          TRANSFER OR ASSIGNMENT MAY BE EFFECTED WITHOUT SUCH REGISTRATION AND
          WILL NOT BE IN VIOLATION OF APPLICABLE SECURITIES LAWS, AND THE
          COMPANY RECEIVES AN OPINION OF COUNSEL REASONABLY SATISFACTORY TO THE
          COMPANY (IT BEING ACKNOWLEDGED THAT THE OPINION OF SACHNOFF & WEAVER,
          LTD SHALL BE SATISFACTORY) THAT REGISTRATION UNDER SUCH ACT AND SUCH
          APPLICABLE STATE SECURITIES LAWS IS NOT REQUIRED.

No. WD(iii)-[___]                                                 [______], 2002

                          Common Stock Purchase Warrant
                                       of
                           Spectra Systems Corporation

     Spectra Systems Corporation, a Delaware corporation (the "Company") hereby
certifies that, for value received, [_________] (the "Holder"), or its
successors or registered assigns, is entitled, subject to the terms set forth
below, to purchase from the Company, at any time or from time to time before
5:00 p.m., Boston time, on the Expiration Date (as hereinafter defined),
[_________] fully paid and non-assessable shares of Common Stock (the "Warrant
Number"), at a purchase price per share of US$5.00 (the "Purchase Price"). The
Warrant Number and the Purchase Price are subject to adjustment as provided in
this Warrant.

1.   Definitions.

     As used herein, the following terms, unless the context otherwise required,
have the following respective meanings:

     1.1  The term "Company" shall include Spectra Systems Corporation and any
     entity that shall succeed to or assume the obligations of Spectra Systems
     Corporation hereunder.

     1.2  The term "Common Stock" includes (i) the Company's Common Stock as
     authorized on the date of this Warrant; (ii) any other capital stock of any
     class of classes (however designated) of the Company, authorized on or
     after the date of this Warrant, the holders of which shall have the right,
     without limitation as to amount, either to all or to a share of the balance
     of current dividends and liquidating dividends after the payment of
     dividends and distributions on any shares entitled to a preference; and
     (iii) any other securities into which or for which any of the securities
     described in (i) or (ii) may be converted or exchanged pursuant to a plan
     of recapitalization, reorganization, merger, sale or assets of otherwise.

     1.3  The term "Other Securities" refers to any stock (other than Common
     Stock) and other securities of the Company or any other person (corporate
     or otherwise) which the

<PAGE>

     holder of the Warrant at any time shall be entitled to receive, or shall
     have received, on the exercise of the Warrant, in lieu of or in addition to
     Common Stock to be issued pursuant to this Warrant, or which at any time
     shall be issuable or shall have been issued in exchange for or in
     replacement of Common Stock or Other Securities.

     1.4  The term "Expiration Date" refers to September 1, 2005.

     1.5  For the term "Conversion Price of the Series D Convertible Preferred
     Stock" shall have the meaning set forth in the Company's Amended and
     Restated Certificate of Incorporation, as amended.

2.   Exercise; Net Issuance Provision.

     2.1  Exercise. This Warrant may be exercised in full or in part at any time
     or from time to time until the Expiration Date by the Holder hereof by
     surrender of this Warrant and the subscription form annexed hereto (duly
     executed by the Holder) to the Company at its principal office, accompanied
     by payment, in cash or by certified or official bank check payable to the
     order of the Company in the amount obtained by multiplying (a) the number
     of shares of Common Stock designated by the Holder in that subscription
     form by (b) the Purchase Price then in effect. On any partial exercise of
     this Warrant, the Company, at its expense, will forthwith issue and deliver
     to or upon the order of the Holder hereof a new Warrant or Warrants of like
     tenor, in the name of the Holder hereof or as such Holder (upon payment by
     such Holder of any applicable transfer taxes) may request, providing in the
     aggregate on the face or faces thereof for the number of shares of Common
     Stock for which such Warrant or Warrants may still be exercised.

     2.2  Net Issuance.

          (i)    In addition to the rights set forth in Section 2.1 hereof, the
     Holder shall have the right (the "Conversion Right") to require the Company
     to convert this Warrant, in whole or in part, at any time prior to the
     Expiration Date into shares of Common Stock as provided for in this Section
     2.2. At the sole option of the Holder, upon exercise of the Conversion
     Right, the Company shall deliver to the Holder (without payment by the
     Holder of any Purchase Price) that number of shares of Common Stock equal
     to the quotient obtained by dividing (x) the value of the Warrant at the
     time the Conversion Right is exercised (determined by subtracting the
     aggregate Purchase price for the shares of Common Stock then issuable upon
     exercise of this Warrant (the "Warrant Shares") in effect immediately prior
     to the exercise of the Conversion Right from the aggregate Fair Market
     Value for the Warrant Shares immediately prior to the exercise of the
     Conversion Right) by (y) the Fair Market Value of one share of Common Stock
     immediately prior to the exercise of the Conversion Right.

          (ii)   The Conversion Right may be exercised by the Holder, at any
     time, or from time to time, prior to the Expiration Date, on any business
     day by delivering a written notice (the "Conversion Notice") to the Company
     exercising the Conversion Right and specifying (a) the total number of
     shares of Common Stock the Holder will purchase pursuant to such conversion
     and (b) a place and date not less than one nor more than 20 business days
     from the date of the Conversion Notice for the closing of such purchase.

          (iii)  At any closing under this Section 2.2, (a) the Holder will
     surrender the Warrant, and (b) the Company will deliver to the Holder a
     certificate or certificates for the

                                      -2-

<PAGE>

     number of shares of Common Stock issuable upon such conversion, together
     with cash, in lieu of any fraction of a share, as provided in Section 3
     below.

          (iv)   The "Fair Market Value" of a share of Common Stock as of a
     particular date (the "Determination Date") shall mean:

                 (a)  If the Company's Common Stock is traded on an exchange or
          is quoted on the National Association of Securities Dealers, Inc.
          Automated Quotation ("NASDAQ") National Market System, then Fair
          Market Value shall mean the closing or last sale price, respectively,
          reported for the last business day immediately preceding the
          Determination Date;

                 (b)  If the Company's Common Stock is not traded on an exchange
          or on the NASDAQ National Market System but is traded in the
          over-the-counter market, then Fair Market Value shall mean the closing
          bid and asked prices reported for the last business day immediately
          preceding the Determination Date;

                 (c)  If the Determination Date is the date on which the
          Company's Common Stock is first sold to the public by the Company is a
          firm commitment public offering under the Securities Act of 1933, as
          amended (the "1933 Act"), then Fair Market Value shall mean the
          initial public offering price (before deducting commissions, discounts
          or expenses) at which the Common Stock is sold in such offering; and

                 (d)  If the Determination Date is none of the foregoing clauses
          (a), (b), and (c), then Fair Market Value will be determined by the
          Company's Board of Directors, acting in good faith; provided that in
          the event that the Holder disagrees with the Board's determination of
          Fair Market Value under this clause (d), then the Holder shall have
          the right to withdraw its conversion of this option by giving written
          notice of his, her, or its withdrawal within three business days after
          notice of the Board's determination of Fair Market Value has been
          delivered to the Holder.

3.   Delivery of Stock Certificates, etc., on Exercise. As soon as practicable
after the exercise conversion of this Warrant, and in any event within twenty
days thereafter, the Company, at its expense (including the payment by it of any
applicable issue or stamp taxes), will cause to be issued in the name of and
delivered to the Holder hereof, or as such Holder (upon payment by such Holder
of any applicable transfer taxes) may direct, a certificate or certificates for
the number of fully paid and nonassessable shares of Common Stock (or Other
Securities) to which such Holder shall be entitled on such exercise, in such
denominations as may be requested by such Holder, plus, in lieu of any
fractional share to which such Holder would otherwise be entitled, cash equal to
such fraction multiplied by the then current market value (as determined in good
faith by the Board of Directors) of one full share, together with any other
stock or other securities and property (including cash, where applicable) to
which such Holder is entitled upon such exercise pursuant to Section 2. Any
Holder that received this Warrant pursuant to Regulation S promulgated under the
Securities Act of 1933, as amended shall not exercise or convert this Warrant
within the United States, nor shall the Common Stock issuable upon exercise or
conversion of this Warrant be delivered within the United States, other than (i)
as part of a sale deemed to meet the definition of an "offshore transaction"
pursuant to Rule 902(h) of Regulation S, (ii) pursuant to an effective
registration statement under the Securities Act of 1933, as amended, or (iii)
unless an exemption from registration is available, and in the case of a
transaction pursuant to clauses (i) or (iii) of this sentence, the

                                      -3-

<PAGE>

Company receives an opinion of counsel satisfactory to the Company (it being
acknowledged that Sachnoff & Weaver, Ltd., is satisfactory).

4.   Adjustment for Dividends in Other Stock, Property, etc.; Reclassification,
etc. In case, at any time, or from time to time, the Holders of Common Stock (or
Other Securities) shall have received, or (on or after the record date fixed for
the determination of shareholders eligible to receive) shall have become
entitled to receive, without payment therefor, (i) other or additional stock or
other securities or property (other than cash) by way of dividend, (ii) any cash
(excluding cash dividends payable solely out of earnings or earned surplus of
the Company), or (iii) other or additional stock or other securities or property
(including cash) by way of spin-off, split-up, reclassification,
recapitalization, combination of shares of similar corporate rearrangement,
other than additional shares of Common Stock (or Other Securities) issued as a
stock dividend or in a stock-split (adjustments in respect of which are provided
for in Section 8), then and in each such case the Holder of this Warrant, on the
exercise hereof as provided in Section 2, shall be entitled to receive the
amount of stock and Other Securities and property (including cash in the cases
referred to in subdivisions (ii) and (iii) of this Section 5) which such Holder
would hold on the date of such exercise if on the date hereof he had been the
Holder of record of the number of shares of Common Stock called for on the face
of this Warrant and had thereafter, during the period from the date hereof to
and including the date of such exercise, retained such shares and all such other
or additional stock and other securities and property receivable by him as
aforesaid during such period, giving effect to all adjustments called for during
such period by Section 5.

5.   Adjustment for Reorganization, Consolidation, Merger, etc.

     5.1  General. In case, at any time or from time to time, the Company shall
     (i) effect a reorganization, (ii) consolidate with or merge into any other
     person in which the Company is not the surviving entity, or (iii) transfer
     all or substantially all of its properties or assets to any other person
     under any plan or arrangement contemplating the dissolution of the Company,
     then, in each such case, the Holder of this Warrant, on the exercise hereof
     as provided in Section 2 at any time within ten business days after the
     consummation of such reorganization, consolidation or merger or the
     effective date of such dissolution, as the case may be, shall receive, in
     lieu of the Common Stock (or Other Securities) issuable on such exercise
     prior to such consummation or such effective date, the stock and other
     securities and property (including cash) to which such Holder would have
     been entitled upon such consummation or in connection with such
     dissolution, as the case may be, if such Holder had so exercised this
     Warrant, immediately prior to such reorganization, consolidation, merger or
     transfer of all or substantially all of the Company's property or assets.

     5.2  Continuation of Terms. Upon any reorganization, consolidation, merger
     or transfer (and any dissolution following any transfer) referred to in
     5.1, and in the event that this Warrant is not exercised in accordance with
     the provisions of Section 5.1, then this Warrant shall continue in full
     force and effect and the terms hereof shall be applicable to the shares of
     stock and other securities and property receivable on the exercise of this
     Warrant after the consummation of such reorganization, consolidation or
     merger or the effective date of dissolution following any such transfer, as
     the case may be, and shall be binding upon the issuer of any such stock or
     other securities, including, in the case of any such transfer, the person
     acquiring all or substantially all of the properties or assets of the
     Company, whether or not such person shall have expressly assumed the terms
     of this Warrant.

                                      -4-

<PAGE>

6.   Anti-Dilution Provisions. If the Company shall, at any time or from time to
time, issue, sell or otherwise dispose of any securities that would result in an
adjustment to the Conversion Price of the Series D Convertible Preferred Stock,
as provided in Article FOURTH, Section B(6)D(3) of the Company's Amended and
Restated Certificate of Incorporation, as may be amended from time to time,
then, and in each such case: (a) the Purchase Price shall be lowered to the
price (but in no event below $.01 per share) determined by dividing (i) an
amount equal to the sum of (x) the number of shares of Common Stock outstanding
immediately prior to such issue or sale multiplied by the then existing Purchase
Price, and (y) the consideration, if any, received by the Corporation upon such
issue or sale, by (ii) the total number of shares of Common Stock outstanding
immediately after such issue or sale; and (b) the Holder of this Warrant shall
thereafter, on the exercise hereof as provided in Section 1, be entitled to
receive the Warrant Number determined by multiplying the Warrant Number which
would be issuable on such exercise immediately prior to such issuance by the
fraction of which (i) the numerator is the Purchase Price in effect immediately
prior to such issuance and (ii) the denominator is the Purchase Price in effect
on the date of such exercise.

7.   Dilution in Case of Other Securities. In case any Other Securities shall be
issued or sold, or shall become subject to issue upon the conversion or exchange
of any stock (or Other Securities) of the Company (or any other issuer of Other
Securities or any other person referred to in Section 5) or to subscription,
purchase or other acquisition pursuant to any rights or options granted by the
Company (or such other issuer or person), for a consideration per share such as
to dilute the purchase rights evidenced by this Warrant, the computations,
adjustments and readjustments provided for with respect to the Purchase Price
and the number of shares of Common Stock issuable upon exercise of this Warrant
shall be made as nearly as possible in the manner so provided and applied to
determine the amount of Other Securities from time to time receivable on the
exercise of the Warrants, so as to protect the Holders of the Warrants against
the effect of such dilution.

8.   Adjustment for Extraordinary Events. In the event that the Company shall
(i) issue additional shares of the Common Stock as a dividend or other
distribution on outstanding Common Stock, (ii) subdivide or reclassify its
outstanding shares of Common Stock, or (iii) combine its outstanding shares of
Common Stock into a smaller number of shares of Common Stock, then, in each such
event, the Purchase Price shall, simultaneously with the happening of such
event, be adjusted by multiplying the then Purchase Price by a fraction, the
numerator of which shall be the number of shares of Common Stock outstanding
immediately prior to such event and the denominator of which shall be the number
of shares of Common Stock outstanding immediately after such event, and the
product so obtained shall thereafter be the Purchase Price then in effect. The
Purchase Price, as so adjusted, shall be readjusted in the same manner upon the
happening of any successive event or events described herein in this Section 8.
The Holder of this Warrant shall thereafter, on the exercise hereof as provided
in Section 2, be entitled to receive that number of shares of Common Stock which
would be issuable on such exercise as of immediately prior to such issuance by a
fraction of which (i) the numerator is the Purchase Price in effect immediately
prior to such issuance and (ii) the denominator is the Purchase Price in effect
on the date of such exercise.

9.   No Impairment. The Company will not, by amendment of its Certificate of
Incorporation or through any reorganization, transfer of assets, consolidation,
merger, dissolution, or any other similar voluntary action, avoid or seek to
avoid the observance or performance of any the terms of this Warrant, but will
at all times in good faith assist in the carrying out of all such terms and in
the taking of all such action as may be necessary or appropriate in order to
protect the rights of the Holder of the Warrant against impairment due to such
event. Without limiting the generality of the foregoing, the Company (a) will
not increase the par value of any shares of

                                      -5-

<PAGE>

stock receivable on the exercise of the Warrant above the amount payable
therefore on such exercise, (b) will take all action that may be necessary or
appropriate in order that the Company may validly and legally issue fully paid
and nonassessable shares of stock, free from all taxes, liens and charges with
respect to the issue thereof, on the exercise of all of the Warrants from time
to time outstanding, and (c) will not consolidate with or merge into any other
person or permit any such person to consolidate with or merge into the Company
(if the Company is not the surviving person), unless such other person shall,
pursuant to Section 5 hereof, expressly assume in writing and will be bound by
all the terms of this Warrant.

10.  Accountants' Certificate as to Adjustments. In each case of any adjustment
or readjustment in the shares of Common Stock (or Other Securities) issuable on
the exercise of the Warrants, the Company at its expense will promptly cause
independent certified public accountants of recognized national standing
selected by the board of directors of the Company to compute such adjustment or
readjustment in accordance with the terms of this Warrant and prepare a
certificate setting forth such adjustment or readjustment, the Purchase Price
resulting therefrom and the increase or decrease, if any, or the number of
shares purchasable at such price upon exercise of the Warrant, and showing in
detail the facts and computation upon which such adjustment or readjustment is
based. The Company will forthwith mail a copy of each such certificate to each
registered Holder of this Warrant, and will, on the written request at any time
of the Holder of this Warrant, furnish to such Holder a like certificate setting
forth the Purchase Price at the time in effect and showing how it was
calculated.

11.  Notices of Record Date, etc.  In the event of

     (a)  any taking by the Company of a record of the Holders of any class of
     securities for the purpose of determining the Holders thereof who are
     entitled to receive any dividend on, or any right to subscribe for,
     purchase or otherwise acquire any shares of stock of any class or any other
     securities or property, or to receive any other right, or

     (b)  any capital reorganization of the Company, any reclassification or
     recapitalization of the capital stock of the Company or any transfer of all
     or substantially all the assets of the Company to or consolidation or
     merger of the Company with or into any other person, or

     (c)  any voluntary or involuntary dissolution, liquidation or winding-up of
     the Company,

then and in each such event the Company will, at least ten calendar days before
such event, mail or cause to be mailed to the registered Holder of this Warrant
a notice specifying (i) the date on which any such record is to be taken for the
purpose of such dividend, distribution or right, and stating the amount and
character of such dividend, distribution or right, (ii) the date on which any
such reorganization, reclassification, recapitalization, transfer,
consolidation, merger, dissolution, liquidation or winding-up is to take place,
and the time, if any is to be fixed, as of which the Holders of record of Common
Stock (or Other Securities) shall be entitled to exchange their shares of Common
Stock (or Other Securities) for securities of other property deliverable on such
reorganization, reclassification, recapitalization, transfer, consolidation,
merger, dissolution, liquidation or winding-up, and (iii) the amount and
character of any stock or other securities, or rights or options with respect
thereto, proposed to be issued or granted, the date of such proposed issue or
grant and the persons or class of persons to whom such proposed issue or grant
is to be offered or made. Such notice shall also state that the action in
question or the record date is subject to the effectiveness of a registration
statement under the Securities Act of 1933, as amended (the "Securities Act"),
or a favorable vote of stockholders if

                                      -6-

<PAGE>

either is required. Such notice shall be mailed at least twenty days prior to
the date specified in such notice on which any such action is to be taken or the
record date, whichever is earlier.

12.  Reservation of Stock, etc., Issuable on Exercise of Warrants. The Company
will at all times reserve and keep available, solely for issuance and delivery
on the exercise of the Warrant, all shares of Common Stock (or Other Securities)
from time to time issuable on the exercise of the Warrant.

13.  Registration. In the absence of any applicable exemptions, if the issuance
of any shares of Common Stock required to be reserved for purposes of exercise
of this Warrant or for the conversion of such shares requires registration with
or approval or any Federal governmental authority under any Federal or state law
(other than any registration under the Securities Act) or listing on any
national securities exchange, before such shares may be issued upon exercise of
this Warrant or such conversion, the Company will, at the Holder's request and
expense, use its best efforts to cause such shares to be duly registered or
approved, or listed on the relevant national securities exchange, as the case
may be, at such time, so that such shares may be issued in accordance with the
terms hereof and so converted.

14.  Transfer of Warrant. The transfer of this Warrant and all rights hereunder,
in whole or in part, is registrable at the office or agency of the Company
referred to below by the Holder hereof in person or by his duly authorized
attorney, upon surrender of this Warrant properly endorsed. Each taker and
Holder of this Warrant, by taking or holding the same, consents and agrees that
this Warrant, when endorsed in blank, shall be deemed negotiable, and that the
Holder hereof, when this Warrant shall have been so endorsed, may be treated by
the Company and all other persons dealing with this Warrant as the absolute
owner and Holder hereof for any purpose and as the person entitled to exercise
the rights represented by this Warrant, or to the registration of transfer
hereof on the books of the Company; and until due presentation for registration
of transfer on such books the Company may treat the registered Holder hereof as
the owner and Holder for all purposes, and the Company shall not be affected by
notice to the contrary. Prior to transferring this Warrant, the Holder shall
provide an opinion of counsel reasonably satisfactory to the Company (it being
acknowledged that Sachnoff & Weaver, Ltd. is satisfactory), indicating that the
Warrant may be resold in the proposed manner in compliance with and without
registration under applicable securities laws. The Company shall refuse to
recognize any proposed transfer of the Warrant not in compliance with the
provisions of this Section 14.

15.  Register of Warrants. The Company shall maintain, at the principal office
of the Company (or such other office as it may designate by notice to the Holder
hereof), a register for the Warrants, in which the Company shall record the name
and address of the person in whose name a Warrant has been issued, as well as
the name and address of each transferee and each prior owner of such Warrant.

16.  Exchange of Warrants. This Warrant is exchangeable, upon the surrender
hereof by the Holder hereof at the office or agency of the Company, for one or
more new Warrants of like tenor representing in the aggregate the right to
subscribe for the purchase the number of shares of Common Stock which may be
subscribed for and purchase hereunder, each of such new Warrants to represent
the right to subscribe for and purchase such number of shares as shall be
designated by said Holder hereof at the time of such surrender.

17.  Replacement of Warrants. On receipt of evidence reasonably satisfactory to
the Company of the loss, theft, destruction or utilization of this Warrant and,
in the case of any such loss, theft or distribution of this Warrant, on delivery
of an indemnity agreement or security

                                      -7-

<PAGE>

reasonably satisfactory in form and amount to the Company or, in the case of any
such mutilation, on surrender and cancellation of such Warrant, the Company at
its expense will execute and deliver, in lieu thereof, a new Warrant of like
tenor.

18.  Remedies. The Company stipulates that the remedies at law of the Holder of
this Warrant in the event of any default or threatened default by the Company in
the performance of or compliance with any of the terms of this Warrant are not
and will not be adequate, and that such terms may be specifically enforced by a
decree for the specific performance of any agreement contained herein or by an
injunction against a violation of any of the terms hereof or otherwise.

19.  Closing of Books. The Company will at no time close its transfer books
against the transfer or any warrant or of any shares of Common Stock issued or
issuable upon the exercise of any Warrant in any manner which interferes with
the timely exercise of this Warrant.

20.  No Rights or Liabilities as a Stockholder. This Warrant shall not entitle
the Holder hereof to any voting rights or other rights as a stockholder of the
Company; provided that nothing herein shall be construed to affect any rights a
Holder hereof may have under the Agreement. No provision of this Warrant, in the
absence of affirmative action by the Holder hereof to purchase Common Stock, and
no mere enumeration herein of the rights or privileges of the Holder hereof
shall give rise to any liability of such Holder for the Purchase Price or as a
stockholder of the Company, whether such liability is asserted by the Company or
by creditors of the Company.

21.  Notices, etc. All notices and other communications from the Company to the
registered Holder of this Warrant shall be mailed by first class registered or
certified mail, postage prepaid, at such address as may have been furnished to
the Company in writing by such Holder or at the address shown on such Holder's
Warrant.

22.  Miscellaneous. This Warrant and any term hereof may be changed, waived,
discharged or terminated only by an instrument in writing signed by the party
against which enforcement of such change, waiver, discharge or termination is
sought. This Warrant shall be construed and enforced in accordance with and
governed by the general corporate laws of the State of Delaware. The headings in
this Warrant are for purposes of reference only, and shall not limit or
otherwise affect any of the terms hereof. This Warrant is being executed as an
instrument under seal. The invalidity or unenforceability of any provision
hereof shall in no way affect the validity or enforceability of any other
provision.

                                        SPECTRA SYSTEMS CORPORATION

                                        ________________________________________
                                        By: Sam Sacco, Chief Financial Officer

Accepted and Agreed:

__________________________
By:

                                      -8-

<PAGE>

                              FORM OF SUBSCRIPTION
                   (To be signed only on exercise of Warrant)

                        SPECTRA SYSTEMS CORPORATION, INC.

     The undersigned, the Holder of the within Warrant, hereby irrevocably
elects to exercise this Warrant for, and to purchase thereunder, _____ shares of
Common Stock of Spectra Systems Corporation and herewith makes payment of $_____
therefore in cash, and requests that the certificates for such shares be issued
in the name of, and delivered to ______________________________ whose address is
______________________________.

Dated: ___________________

                                             ___________________________________
                                             (Signature)

                                             ___________________________________
                                             (Name)

                                             ___________________________________
                                             (Address)

<PAGE>

                               FORM OF ASSIGNMENT
                   (To be signed only on transfer of Warrant)

     For value received, the undersigned hereby sells, assigns, and transfers
unto _____________________ the right represented by the within Warrant to
purchase _____ shares of Common Stock of SPECTRA SYSTEMS CORPORATION to which
the within Warrant relates, and appoints ____________________ attorney to
transfer such right on the books of SPECTRA SYSTEMS CORPORATION with full power
of substitution in the premises.

Dated: ___________________

                                             ___________________________________
                                             (Signature)

                                             ___________________________________
                                             (Name)

                                             ___________________________________
                                             (Address)

          [The terms of the Warrant contain restrictions on transfer.]

                                      -10-<PAGE>

                                                                    Exhibit 4.11

          THE SECURITIES REPRESENTED BY THIS WARRANT HAVE BEEN ACQUIRED FOR
          INVESTMENT, HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933,
          AS AMENDED (THE "ACT"), OR UNDER ANY STATE SECURITIES LAWS, AND MAY
          NOT BE SOLD, TRANSFERRED, OR ASSIGNED EXCEPT: (i) PURSUANT TO AN
          EFFECTIVE REGISTRATION THEREOF UNDER THE ACT AND APPLICABLE STATE LAW
          OR (ii) IF THE PROPOSED SALE, TRANSFER OR ASSIGNMENT MAY BE EFFECTED
          WITHOUT SUCH REGISTRATION AND WILL NOT BE IN VIOLATION OF APPLICABLE
          SECURITIES LAWS, AND THE COMPANY RECEIVES AN OPINION OF COUNSEL
          REASONABLY SATISFACTORY TO THE COMPANY THAT REGISTRATION OR
          QUALIFICATION UNDER SUCH APPLICABLE SECURITIES LAWS IS NOT REQUIRED.

          THIS WARRANT IS SUBJECT TO RESTRICTIONS ON TRANSFER AS SET FORTH IN
          THE SPECTRA SCIENCE CORPORATION FOURTH AMENDED AND RESTATED
          STOCKHOLDERS' AGREEMENT AS THE SAME MAY BE AMENDED FROM TIME TO TIME.

W(5) - [____]                                                       [____], 2001

                          Common Stock Purchase Warrant
                                       of
                           Spectra Science Corporation

1.   Warrant Right. Spectra Science Corporation, a Delaware corporation (the
"Company"), hereby certifies that, for value received, [____] (the "Holder"), or
its successors and permitted assigns, is entitled, subject to the terms set
forth below, to purchase from the Company, at any time or from time to time
before 5:00 p.m., Boston time, on July 1, 2006, (the "Expiration Date"): [____]
fully paid and non-assessable shares of Common Stock, par value $.01 (the
"Warrant Number"), at a purchase price per share of US$5.00 (the "Purchase
Price").

2.   Exercise; Net Issuance Provision.

     2.1  Exercise. This Warrant may be exercised in full or in part at any time
     or from time to time until the Expiration Date by the Holder hereof by
     surrender of this Warrant and the subscription form annexed hereto (duly
     executed by the Holder) to the Company at its principal office, accompanied
     by payment, in cash or by certified or bank check payable to the order of
     the Company in the amount obtained by multiplying (a) the number of shares
     of Common Stock designated to be purchased by the Holder in that
     subscription form by (b) the Purchase Price. On any partial exercise of
     this Warrant, the Company, at its expense, will forthwith issue and deliver
     to the Holder hereof a new Warrant of like tenor, providing in the
     aggregate on the face thereof for the number of shares of Common Stock for
     which such Warrant may still be exercised.

                                             Warrant to Purchase Common Stock- 1

<PAGE>

     2.2  Net Issuance.

     (a)  The Holder shall also have the right (the "Conversion Right") to cause
     the Company to convert this Warrant, in whole or in part, at any time prior
     to the Expiration Date, into shares of Common Stock as provided for in this
     Section 2.2. Upon exercise of the Conversion Right, the Company shall
     deliver to the Holder (without payment by the Holder of any Purchase Price)
     that number of shares of Common Stock equal to the quotient obtained by
     dividing (x) the value of the Warrant at the time the Conversion Right is
     exercised (determined by subtracting the aggregate Purchase Price for the
     shares of Common Stock then issuable upon exercise of this Warrant (the
     "Warrant Shares") in effect immediately prior to the exercise of the
     Conversion Right from the aggregate fair market value for the Warrant
     Shares immediately prior to the exercise of the Conversion Right) by (y)
     the Purchase Price.

     (b)  The Conversion Right may be exercised by the Holder, at any time, or
     from time to time, prior to the Expiration Date, on any business day by
     surrender of this Warrant and delivery of a written notice in the form
     annexed hereto (duly executed by the Holder) (the "Conversion Notice") to
     the Company exercising the Conversion Right and specifying (i) the total
     number of shares of Common Stock the Holder will purchase pursuant to such
     conversion and (ii) a place and date not more than twenty business days
     from the date of the Conversion Notice for the closing of such purchase.

     (c)  At any closing under this Section 2.2, (i) the Holder will surrender
     the Warrant, and (ii) the Company will deliver to the Holder a certificate
     for the number of shares of Common Stock issuable upon such conversion,
     together with cash, in lieu of any fraction of a share, as provided in
     Section 3 below.

3.   Delivery of Stock Certificates, etc., on Exercise. As soon as practicable
after the exercise conversion of this Warrant, and in any event within twenty
days thereafter, the Company, at its expense (including the payment by it of any
applicable issue or stamp taxes), will cause to be issued in the name of and
delivered to the Holder hereof a certificate or certificates for the number of
fully paid and non-assessable shares of Common Stock to which such Holder shall
be entitled on such exercise, in such denominations as may be requested by such
Holder, plus, in lieu of any fractional share to which such Holder would
otherwise be entitled, cash equal to such fraction multiplied by the then
current fair market value (as determined in good faith by the Board of Directors
of the Company) of one full share, together with any other stock or other
securities and property (including cash, where applicable) to which such Holder
is entitled upon such exercise or conversion pursuant to Section 2.

4.   Adjustment for Dividends in Other Stock, Property, etc.; Reclassification,
etc. In case, at any time, or from time to time, the Holders of Common Stock
shall have received, or (on or after the record date fixed for the determination
of shareholders eligible to receive shall have become entitled to receive),
without payment therefor, (i) other or additional stock or other securities or
property (other than cash) by way of dividend, (ii) any cash (excluding cash
dividends payable out of earnings or earned surplus of the Company), or (iii)
other or additional stock or other securities or property (including cash) by
way of spin-off, split-up, reclassification, recapitalization, combination of
shares of similar corporate rearrangement, other than additional shares of
Common Stock issued as a stock dividend or in a stock-split (adjustments in
respect of

                                             Warrant to Purchase Common Stock- 2

<PAGE>

which are provided for in Section 6), then and in each such case the Holder of
this Warrant, on the exercise or conversion hereof as provided in Section 2,
shall be entitled to receive the amount of stock and property (including cash in
the cases referred to in subdivisions (ii) and (iii) of this Section 4) which
such Holder would hold on the date of such exercise if on the date hereof he had
been the Holder of record of the number of shares of Common Stock called by this
Warrant (adjusted to the shares actually issued to the Holder upon exercise of
the Conversion Right) and had thereafter, during the period from the date hereof
to and including the date of such exercise, retained such shares and all such
other or additional stock and other securities and property receivable by him as
aforesaid during such period, giving effect to all adjustments called for during
such period by Section 5 and Section 6 hereof.

5.   Adjustment for Reorganization, Consolidation, Merger, etc.

     5.1  General. In case, at any time or from time to time, the Company shall
     (i) effect a reorganization, (ii) consolidate with or merge into any other
     person in which the Company is not the surviving entity, or (iii) transfer
     all or substantially all of its properties or assets to any other person
     under any plan or arrangement contemplating the dissolution of the Company,
     then, in each such case, the Holder of this Warrant, on the exercise or
     conversion hereof as provided in Section 2 at any time within ten business
     days after the consummation of such reorganization, consolidation or merger
     or the effective date of such dissolution, as the case may be, shall
     receive, in lieu of the Common Stock issuable on such exercise prior hereof
     to such consummation or such effective date, the stock and other securities
     and property (including cash) to which such Holder would have been entitled
     upon such consummation or in connection with such dissolution, as the case
     may be, if such Holder had so exercised or converted this Warrant
     immediately prior to such reorganization, consolidation, merger or transfer
     of all or substantially all of the Company's property or assets.

     5.2  Continuation of Terms. Upon any reorganization, consolidation, merger
     or transfer (and any dissolution following any transfer) referred to in
     Section 5.1, and in the event that this Warrant is not exercised in
     accordance with the provisions of Section 5.1, then this Warrant shall
     continue in full force and effect and the terms hereof shall be applicable
     to the shares of stock and other securities and property receivable on the
     exercise of this Warrant after the consummation of such reorganization,
     consolidation or merger or the effective date of dissolution following any
     such transfer, as the case may be, and shall be binding upon the issuer of
     any such stock or other securities, including, in the case of any such
     transfer, the person acquiring all or substantially all of the properties
     or assets of the Company, whether or not such person shall have expressly
     assumed the terms of this Warrant.

6.   Adjustment for Extraordinary Events. In the event that the Company shall
(i) issue additional shares of Common Stock as a dividend or other distribution
on outstanding Common Stock, (ii) subdivide or reclassify its outstanding shares
of Common Stock, or (iii) combine its outstanding shares of Common Stock into a
smaller number of shares of Common Stock ("Additional Shares"), then, in each
such event, the Warrant Number shall, simultaneously with the happening of such
event, be adjusted to reflect such event to allow the Holder hereof to exercise
or convert this Warrant with respect to such Additional Shares.

                                             Warrant to Purchase Common Stock- 3

<PAGE>

7.   No Impairment. The Company will not, by amendment of its Amended or
Restated Certificate of Incorporation or through any reorganization, transfer of
assets, consolidation, merger, dissolution, or any other similar voluntary
action, avoid or seek to avoid the observance or performance of any the terms of
this Warrant, but will at all times in good faith assist in the carrying out of
all such terms and in the taking of all such action as may be necessary or
appropriate in order to protect the rights of the Holder of the Warrant against
impairment due to such event. Without limiting the generality of the foregoing,
the Company (a) will not increase the par value of any shares of stock
receivable on the exercise of the Warrant above the amount payable therefore on
such exercise, (b) will take all action that may be necessary or appropriate in
order that the Company may validly and legally issue fully paid and
non-assessable shares of stock, free from all taxes, liens and charges with
respect to the issue thereof, on the exercise of all of the Warrants from time
to time outstanding, and (c) will not consolidate with or merge into any other
person or permit any such person to consolidate with or merge into the Company
(if the Company is not the surviving person), unless such other person shall,
pursuant to Section 5 hereof, expressly assume in writing and will be bound by
all the terms of this Warrant.

8.   Notices of Record Date, etc.  In the event of

     (a)  any taking by the Company of a record of the Holders of any class of
     securities for the purpose of determining the Holders thereof who are
     entitled to receive any dividend on, or any right to subscribe for,
     purchase or otherwise acquire any shares of stock of any class or any other
     securities or property, or to receive any other right, or

     (b)  any capital reorganization of the Company, any reclassification or
     recapitalization of the capital stock of the Company or any transfer of all
     or substantially all the assets of the Company to or consolidation or
     merger of the Company with or into any other person, or

     (c)  any voluntary or involuntary dissolution, liquidation or winding-up of
     the Company,

then and in each such event the Company will, at least ten calendar days before
such event, mail or cause to be mailed to the registered Holder of this Warrant
a notice specifying (i) the date on which any such record is to be taken for the
purpose of such dividend, distribution or right, and stating the amount and
character of such dividend, distribution or right, (ii) the date on which any
such reorganization, reclassification, recapitalization, transfer,
consolidation, merger, dissolution, liquidation or winding-up is to take place,
and the time, if any is to be fixed, as of which the Holders of record of Common
Stock shall be entitled to exchange their shares of Common Stock for securities
of other property deliverable on such reorganization, reclassification,
recapitalization, transfer, consolidation, merger, dissolution, liquidation or
winding-up, and (iii) the amount and character of any stock or other securities,
or rights or options with respect thereto, proposed to be issued or granted, the
date of such proposed issue or grant and the persons or class of persons to whom
such proposed issue or grant is to be offered or made.

9.   Reservation of Stock, etc., Issuable on Exercise of Warrants. The Company
will at all times reserve and keep available, solely for issuance and delivery
on the exercise of the Warrant, all shares of Common Stock from time to time
issuable on the exercise of the Warrant.

                                             Warrant to Purchase Common Stock- 4

<PAGE>

10.  Transfer of Warrant. The transfer of this Warrant and the shares of Common
Stock issuable upon exercise or conversion hereof shall be governed by the
provision of a certain Fourth Amended and Restated Stockholders' Agreement, as
the same may be amended from time to time, a copy of which is available upon
request at the offices of the Company.

11.  Register of Warrants. The Company shall maintain, at the principal office
of the Company (or such other office as it may designate by notice to the Holder
hereof), a register for the Warrant, in which the Company shall record the name
and address of the person in whose name this Warrant has been issued, as well as
the name and address of each transferee and each prior owner of this Warrant.

12.  Replacement of Warrants. On receipt of evidence reasonably satisfactory to
the Company of the loss, theft, destruction or utilization of this Warrant and,
in the case of any such loss, theft or distribution of this Warrant, on delivery
of an indemnity agreement or security reasonably satisfactory in form and amount
to the Company or, in the case of any such mutilation, on surrender and
cancellation of such Warrant, the Company, at its expense, will execute and
deliver, in lieu thereof, a new Warrant of like tenor.

13.  Remedies. The Company stipulates that the remedies at law of the Holder of
this Warrant in the event of any default or threatened default by the Company in
the performance of or compliance with any of the terms of this Warrant are not
and will not be adequate, and that such terms may be specifically enforced by a
decree for the specific performance of any agreement contained herein or by an
injunction against a violation of any of the terms hereof or otherwise.

14.  Closing of Books. The Company will at no time close its transfer books
against the transfer or any warrant or of any shares of Common Stock issued or
issuable upon the exercise or conversion of this Warrant in any manner which
interferes with the timely exercise of this Warrant.

15.  No Rights or Liabilities as a Stockholder. This Warrant shall not entitle
the Holder hereof to any voting rights or other rights as a stockholder of the
Company; provided that nothing herein shall be construed to affect any rights a
Holder hereof may have under the Agreement. No provision of this Warrant, and no
mere enumeration herein of the rights or privileges of the Holder hereof shall
give rise to any liability of such Holder for the Purchase Price or as a
stockholder of the Company, whether such liability is asserted by the Company or
by creditors of the Company.

16.  Notices, etc. All notices and other communications from the Company to the
registered Holder of this Warrant shall be mailed by first class registered or
certified mail, postage prepaid, at such address as may have been furnished to
the Company in writing by such Holder or at the address shown on such Holder's
Warrant.

17.  Fair Market Value. For the purposes of this Agreement, the fair market
value of shares of Common Stock shall be determined in good faith by the Board
of Directors of Spectra Science Corporation, with regard to comparable sales of
and other transactions relating to the Company's securities.

                                             Warrant to Purchase Common Stock- 5

<PAGE>

18.  Miscellaneous. This Warrant and any term hereof may be changed, waived,
discharged or terminated only by an instrument in writing signed by the party
against which enforcement of such change, waiver, discharge or termination is
sought. This Warrant shall be construed and enforced in accordance with and
governed by the general corporate laws of the State of Delaware. The headings in
this Warrant are for purposes of reference only, and shall not limit or
otherwise affect any of the terms hereof. This Warrant is the entire agreement
of the parties with respect to its subject matter. The invalidity or
unenforceability of any provision hereof shall in no way affect the validity or
enforceability of any other provision.

Executed under seal as of the date first written above.

                                        SPECTRA SCIENCE CORPORATION

                                        _________________________________
                                        By: Nabil M. Lawandy
                                        President and Chief Executive Officer

Accepted and Agreed:

[____]

__________________________
By:

Its:

                                             Warrant to Purchase Common Stock- 6

<PAGE>

                              FORM OF SUBSCRIPTION
       (To be signed only on exercise of Warrant pursuant to Section 2.1)

                           SPECTRA SCIENCE CORPORATION

     The undersigned, the Holder of the Warrant attached hereto, hereby
irrevocably elects to exercise this Warrant pursuant to Section 2.1 thereof for,
and to purchase thereunder, _____ shares of Common Stock of Spectra Science
Corporation and herewith makes payment of $_____ therefore in cash.

Dated: ____________________

                                             ___________________________________
                                             (Signature)

                                             ___________________________________
                                             (Name)

                                             ___________________________________
                                             (Address)

                                             Warrant to Purchase Common Stock- 7

<PAGE>

                               FORM OF CONVERSION
     (To be signed only upon conversion of Warrant pursuant to Section 2.2)

                           SPECTRA SCIENCE CORPORATION

     The undersigned, the Holder of the Warrant attached hereto, hereby
irrevocably elects to convert this warrant pursuant to Section 2.2 thereof, into
shares of Common Stock of Spectra Science Corporation.

Dated: ____________________

                                             ___________________________________
                                             (Signature)

                                             ___________________________________
                                             (Name)

                                             ___________________________________
                                             (Address)

                                             Warrant to Purchase Common Stock- 8

<PAGE>

                               FORM OF ASSIGNMENT
                   (To be signed only on transfer of Warrant)

     For value received, the undersigned hereby sells, assigns, and transfers
unto _____________________ the right represented by the within Warrant to
purchase _____ shares of Common Stock of Spectra Science Corporation to which
the within Warrant relates, and appoints ____________________ attorney to
transfer such right on the books of Spectra Science Corporation with full power
of substitution in the premises.

Dated: ____________________

                                             ___________________________________
                                             (Signature)

                                             ___________________________________
                                             (Name)

                                             ___________________________________
                                             (Address)

 [Transfer of this Warrant is subject to the terms of a certain Fourth Amended
      and Restated Stockholders' Agreement, as amended from time to time.]

                                             Warrant to Purchase Common Stock- 9

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00043-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00043-of-00352.parquet"}]]