Document:

<PAGE>
                                                                    Exhibit 4.12

                SERIES E PREFERRED REGISTRATION RIGHTS AGREEMENT

     This SERIES E PREFERRED REGISTRATION RIGHTS AGREEMENT, dated as of July 15,
2002 (the "Agreement"), is entered into by and among Spectra Systems
Corporation, a Delaware corporation with principal offices at 321 South Main
Street, Suite 102, Providence, Rhode Island 02903 (the "Company"), and the
Subscribers (the "Series E Holders") for shares of Series E Redeemable
Convertible Preferred Stock, par value $0.01 ("Series E Preferred"), pursuant to
certain Subscription Agreements dated as of even date herewith (each a
"Subscription Agreement", and collectively, the "Subscription Agreements") as
well as parties who subsequently become parties to this Agreement in accordance
with Section 26 hereof.

Section 1.  Certain Definitions. As used in this Agreement, the following terms
shall have the following respective meanings:

     1.1  "Closing Date" means July 15, 2002.

     1.2  "Commission" means the Securities and Exchange Commission, or any
other federal agency at the time administering the Securities Act and the
Exchange Act.

     1.3  "Common Stock" means the Company's Common Stock, $0.01 par value per
share, as authorized on the date of this Agreement.

     1.4  "Exchange Act" means the Securities Exchange Act of 1934, or any
successor federal statute, as amended, and the rules and regulations of the
Commission thereunder.

     1.5  "Initial Public Offering" means the first underwritten public offering
of Common Stock of the Company conducted on a "firm commitment" or "best
efforts" basis pursuant to an offering registered under the Securities Act with
the Commission on Form S-1 or similar long form registration statement or its
then equivalent.

     1.6  "Qualified Public Offering" means a fully underwritten, firm
commitment public offering pursuant to an effective registration under the
Securities Act covering the offer and sale by the Company of Common Stock in
which the aggregate net proceeds to the Company after deducting underwriters'
discounts and commissions equals or exceeds $30,000,000 and in which the price
per share of Common Stock offered to the public equals or exceeds $5.00 (such
price to be equitably adjusted in the event of any stock dividend, stock split,
combination, recapitalization, reorganization, reclassification or other similar
event).

     1.7  "Person" means an individual, corporation, partnership, joint venture,
trust, or unincorporated organization, or a government or any agency or
political subdivision thereof.

     1.8  "Purchased Shares" means shares of Series E Preferred Stock purchased
pursuant to the Subscription Agreements.

     1.9  "Holders" means the persons or entities listed in Schedule 1 hereto
who execute a counterpart of this Agreement.

<PAGE>

     1.10  "Registrable Shares" means (i) the shares of Common Stock issued and
issuable upon conversion of the Purchased Shares; and (ii) any shares of Common
Stock of the Company acquired by, or issuable upon exercise or conversion of any
securities of the Company acquired by, any Holder after the date hereof.
Registrable Shares shall cease to be Registrable Shares upon any sale pursuant
to a registration statement under the Securities Act or upon any sale to the
public under Rule 144, or any successor rule, promulgated by the Commission
under the Securities Act.

     1.11  "Securities Act" means the Securities Act of 1933, or any successor
federal statute, as amended, and the rules and regulations of the Commission
thereunder.

SECTION 2.  "PIGGY BACK" REGISTRATION. If at any time after the Company's
Initial Public Offering the Company shall determine to register under the
Securities Act (including pursuant to a demand of any stockholder of the Company
exercising registration rights) any of its Common Stock, other than on Form S-8
or Form S-4 or their then equivalent or in connection with a transaction
described under Rule 145 under the Securities Act, it shall send to each holder
of Registrable Shares written notice of such determination at least 30 days
before the anticipated filing date. If within 20 days after receipt of such
notice, such holder shall so request in writing (a "Selling Shareholder"), the
Company shall use its best efforts to include in such registration statement all
the Registrable Shares such holder requests to be registered, except that if, in
connection with any offering involving an underwriting of Common Stock to be
issued by the Company, the managing underwriter shall impose a limitation on the
number of shares of such Common Stock which may be included in any such
registration statement because, in its judgment, such limitation is necessary to
avoid jeopardizing the success of the offering by the Company, and such
limitation is imposed on a pro rata basis among the holders of Common Stock
having an incidental ("piggy back") right to include such Common Stock in the
registration statement according to the amount of such Common Stock which each
Selling Shareholder owns, then the Company shall be obligated to include in such
registration statement only such portion of the Registrable Shares which the
managing underwriter believes may be sold without having such effect; provided,
however, that such limitation shall not be imposed if any shares are to be
included in such underwriting for the account of any person other than the
Company or the requesting holders of Registrable Shares. In connection with any
offering involving an underwriting of Common Stock to be issued by the Company,
the Company shall not be required to include a Selling Shareholder's Registrable
Shares in such underwriting unless such Selling Shareholder accepts the terms of
the underwriting as agreed upon by the Company and the underwriters selected by
the Company. No incidental right under this Section 2 shall be construed to
limit any registration required under Section 3.

SECTION 3.  REQUIRED REGISTRATION. If on any one occasion one or more holders of
not less than fifty-one percent (51%) of the Registrable Shares then outstanding
(including as outstanding for this purpose shares of Common Stock issuable upon
exercise or conversion of outstanding Registrable Shares) shall notify the
Company in writing that it or they intend to offer or cause to be offered
Registrable Shares for public sale, the Company will so notify all holders of
Registrable Shares. Upon written request of any holder of Registrable Shares
given within 15 days after the receipt by such holder from the Company of such
notification, the Company will use its best efforts to cause

<PAGE>

such of the Registrable Shares as may be requested by any holder thereof
(including the holder or holders giving the initial notice of intent to offer)
to be registered under the Securities Act as expeditiously as possible, at the
expense of the Company. If the Company determines to include shares to be sold
by it in any registration requested pursuant to this Section 3, such
registration shall be deemed to be a registration under Section 2 hereof rather
than under this Section 3. In any registration pursuant to this Section 3, the
Company shall not have a right to include any Company shares in such
registration statement unless Holders of a majority of the Registrable Shares
included in such registration statement shall have given their consent.
Notwithstanding the foregoing, (a) the Company shall not be obligated to file a
registration statement pursuant to this Section 3 during the period beginning
with the date 60 days prior to the Company's estimated (in good faith) date of
filing of, and ending on a date four months following the effective date of, a
registration statement (whose preparation was in progress at the beginning of
such 60-day period) pertaining to an underwritten public offering of securities
of the Company, provided that the Company is actively employing in good faith
all reasonable efforts through such period to cause such registration statement
to become effective; and (b) if the Board of Directors of the Company reasonably
determines that immediate registration of such Registrable Shares could have a
material adverse effect upon the Company, the Company may delay commencement of
registration for up to three months after receipt of a request for registration
as referenced above. If the Company elects to delay filing of a registration
statement for such reason, the holders of a majority of the Registrable Shares
requesting to be included in the registration shall have the right to withdraw
such request, which withdrawn request shall be deemed not to have been made. Any
registration requested pursuant to this Section 3 that shall not have become
effective shall not be deemed to be a registration under this Section 3 unless
such registration has not become effective solely as a result of any act or
omission of the holders of Registrable Shares. The holders of the majority of
the Registrable Shares to be included in any registration pursuant to this
Section 3 which is underwritten shall select the managing underwriter for the
public offering subject to the approval of the Company, which approval shall not
be unreasonably withheld.

SECTION 4.  REGISTRATION ON FORM S-3. In addition to the rights provided to the
holders of Registrable Shares in Sections 2 and 3 above, if a registration of
Registrable Shares under the Securities Act can be effected on Form S-3 (or any
similar form promulgated by the Commission), the Company will so notify each
holder of Registrable Shares. Thereafter, upon the request of the holders of at
least 20% of the Registrable Shares then outstanding, the Company will use its
best efforts, at its expense and as expeditiously as possible, to effect the
registration on Form S-3 of all or such portion of the Registrable Shares as any
holder or holders of Registrable Shares shall specify, and the limitations set
forth in Sections 3(b) and 3(c) above shall likewise apply to registrations
under this Section 4. In addition, each registration under this Section 4 must
include Registrable Shares having an anticipated fair market value of at least
$500,000.

SECTION 5.  EFFECTIVENESS. The Company will use its best efforts to maintain the
effectiveness for up to 180 days of any registration statement pursuant to which
any of the Registrable Shares are being offered, and from time to time will
amend or supplement such registration statement and the prospectus contained
therein as and to the extent necessary to comply with the Securities Act and any
applicable state securities statute or regulation.

<PAGE>

SECTION 6.  HOLDER PARTICIPATION. It shall be a condition precedent to the
obligation of the Company to include Registrable Shares of any holder in a
registration statement filed pursuant to Sections 2, 3 or 4 hereof that such
holder furnish the Company with such information regarding the holder, the
Registrable Shares held by the holder and the intended method of disposition of
the holder's Registrable Shares being registered as the Company shall reasonably
request and as may be reasonably required in connection with the action
requested by such holder to be taken by the Company. No person may participate
in any registration hereunder which is underwritten unless such Person (a)
agrees to sell its Registrable Shares being sold in such registration on the
basis set forth in any underwriting agreement approved by the Person or Persons
entitled hereunder to approve such agreement, and (b) completes and executes all
questionnaires, powers of attorney, custody agreements, indemnities and other
documents reasonably required under the terms of such underwriting agreement.

SECTION 7.  INDEMNIFICATION OF HOLDERS OF REGISTRABLE SHARES. In the event that
the Company registers any of the Registrable Shares under the Securities Act, to
the extent permitted by law, the Company will indemnify and hold harmless each
Holder and each underwriter of the Registrable Shares so registered (including
any broker or dealer through whom such shares may be sold) and each Person, if
any, who controls such Holder or any such underwriter within the meaning of
Section 15 of the Securities Act from and against any and all losses, claims,
damages, expenses or liabilities, joint or several, to which they or any of them
become subject under the Securities Act or under any other statute or at common
law or otherwise, and, except as hereinafter provided, will reimburse each such
holder, each such underwriter and each such controlling person, if any, for any
legal or other expenses reasonably incurred by them or any of them in connection
with investigating or defending any actions whether or not resulting in any
liability, insofar as such losses, claims, damages, expenses, liabilities or
actions arise out of or are based upon any untrue statement or alleged untrue
statement of a material fact contained in the registration statement, in any
preliminary or amended preliminary prospectus, in the prospectus (or the
registration statement or prospectus as from time to time amended or
supplemented by the Company), in any other materials deemed to be a prospectus
under the Securities Act or in any blue sky application filed in any state or
other jurisdiction, or arise out of or are based upon the omission or alleged
omission to state therein a material fact required to be stated therein or
necessary in order to make the statements therein not misleading or any
violation by the Company of any rule or regulation promulgated under the
Securities Act applicable to the Company and relating to action or inaction
required of the Company in connection with such registration, unless such untrue
statement or omission was made in such registration statement, preliminary or
amended preliminary prospectus or prospectus in reliance upon and in conformity
with information furnished in writing to the Company in connection therewith by
such holder of Registrable Shares, any such underwriter or any such controlling
person expressly for use therein. Promptly after receipt by any holder of
Registrable Shares, by any underwriter or by any controlling person of notice of
the commencement of any action in respect of which indemnity may be sought
against the Company, such holder of Registrable Shares, or such underwriter or
such controlling person, as the case may be, will notify the Company in writing
of the commencement thereof, and subject to the provisions hereinafter stated,
the Company shall assume the defense of such action (including the employment of
counsel, who shall be counsel reasonably satisfactory to such holder of
Registrable Shares, such underwriter or such controlling person, as the case may
be), and the payment of expenses insofar as such

<PAGE>

action shall relate to any alleged liability in respect of which indemnity may
be sought against the Company. Such holder of Registrable Shares, any such
underwriter and any such controlling person shall have the right to employ
separate counsel in any such action and to participate in the defense thereof
but the fees and expenses of such counsel shall not be at the expense of the
Company unless the employment of such counsel has been specifically authorized
by the Company. The Company shall not be liable to indemnify any person for any
settlement of any such action effected without the Company's consent, which
consent shall not be unreasonably withheld. The failure to notify an
indemnifying party promptly of the commencement of any such action, if
prejudicial to his ability to defend such action, shall relieve such
indemnifying party of any liability to the indemnified party under this Section
7, but the omission so to notify the indemnifying party will not relieve him of
any liability that he may have to any indemnified party otherwise than under
this Section 7.

SECTION 8.  INDEMNIFICATION OF COMPANY. In the event that the Company registers
any of the Registrable Shares under the Securities Act, to the extent permitted
by law, each holder of the Registrable Shares so registered will indemnify and
hold harmless the Company, each of its directors, each of its officers who have
signed the registration statement, each underwriter of the Registrable Shares so
registered (including any broker or dealer through whom any of such Registrable
Shares may be sold), other holders of Registrable Shares, and each person, if
any, who controls the Company within the meaning of Section 15 of the Securities
Act from and against any and all losses, claims, damages, expenses or
liabilities, joint or several, to which they or any of them may become subject
under the Securities Act or under any other statute or at common law or
otherwise, and, except as hereinafter provided, will reimburse the Company and
each such director, officer, underwriter or controlling person for any legal or
other expenses reasonably incurred by them or any of them in connection with
investigating or defending any actions whether or not resulting in any
liability, insofar as such losses, claims, damages, expenses, liabilities or
actions arise out of or are based upon any untrue statement or alleged untrue
statement of a material fact contained in the registration statement, in any
preliminary or amended preliminary prospectus, in the prospectus (or the
registration statement or prospectus as from time to time amended or
supplemented), in any other materials deemed to be a prospectus under the
Securities Act or in any blue sky application filed in any state or other
jurisdiction, or arise out of or are based upon the omission or alleged omission
to state therein a material fact required to be stated therein or necessary in
order to make the statements therein not misleading, but only insofar as any
such statement or omission was made in reliance upon and in conformity with
information furnished in writing to the Company in connection therewith by such
holder of Registrable Shares expressly for use therein; provided, however, that
such holder's obligations hereunder shall be limited in the aggregate to an
amount equal to the proceeds to such holder of the Registrable Shares sold in
such registration. Promptly after receipt of notice of the commencement of any
action in respect of which indemnity may be sought against such holder of
Registrable Shares, the Company shall notify such holder promptly in writing of
the commencement thereof, and such holder of Registrable Shares shall, subject
to the provisions hereinafter stated, assume the defense of such action
(including the employment of counsel, who shall be counsel reasonably
satisfactory to the Company) and the payment of expenses insofar as such action
shall relate to the alleged liability in respect of which indemnity may be
sought against such holder of Registrable Shares. The Company and each such
director, officer, underwriter or controlling person shall have the right to
employ separate counsel in any such action and to participate in the defense
thereof, but the fees and expenses

<PAGE>

of such counsel shall not be at the expense of such holder of Registrable Shares
unless employment of such counsel has been specifically authorized by such
holder of Registrable Shares. Such holder of Registrable Shares shall not be
liable to indemnify any person for any settlement of any such action effected
without such holder's consent, which consent shall not be unreasonably withheld.
The failure to notify an indemnifying party promptly of the commencement of any
such action, if prejudicial to his ability to defend such action, shall relieve
such indemnifying party of any liability to the indemnified party under this
Section 8, but the omission so to notify the indemnifying party will not relieve
him of any liability that he may have to any indemnified party otherwise than
under this Section 8.

SECTION 9.  CONTRIBUTION. If for any reason the indemnity provided in Section 7
or Section 8 is unavailable to a party who would otherwise be entitled to
indemnity thereunder (an "Indemnified Party"), or is insufficient to hold the
Indemnified Party harmless, then the party agreeing to provide indemnity
thereunder (an "Indemnifying Party") agrees to contribute to the amount paid or
payable by an Indemnified Party as a result of any losses, claims, damages,
expenses, liabilities or actions for which indemnity would otherwise be
available, in such proportion as is appropriate to reflect the relative benefits
received by the Indemnified Party and the Indemnifying Party, the relative
faults of those parties and any other relevant equitable considerations.
Notwithstanding the foregoing, the obligations of a holder of Registrable Shares
hereunder and under Section 8 shall be limited to an amount equal to the
proceeds to such holder from sale of the Registrable Shares in the registration
giving rise to the obligations.

SECTION 10.  EXCHANGE ACT REGISTRATION. If the Company at any time shall list
any of its Common Stock on any national securities exchange and shall register
such Common Stock under the Exchange Act, the Company will, at its expense,
simultaneously list on such exchange all of the Registrable Shares, and will
maintain such listing. If the Company becomes subject to the reporting
requirements of either Section 13 or Section 15(d) of the Exchange Act, the
Company will use its best efforts to timely file with the Commission such
information as the Commission may require under either of said Sections; and in
such event, the Company shall use its best efforts to take all action as may be
required as a condition to the availability of Rule 144 under the Securities Act
(or any successor exemptive rule hereinafter in effect) with respect to such
Common Stock.

SECTION 11.  SPECIFIC PERFORMANCE; OTHER RIGHTS. The Company and the Holders
recognize that the rights of the parties under this Agreement are unique, and
accordingly, the Holders shall, in addition to such other remedies as may be
available to any of them at law or in equity, have the right to enforce their
rights hereunder by actions for injunctive relief and specific performance to
the extent permitted by law. Except as provided herein, this Agreement is not
intended to limit or abridge any rights of the parties which may exist apart
from this Agreement.

SECTION 12.  FURTHER OBLIGATIONS OF THE COMPANY. Whenever under the preceding
Sections of this Agreement, the Company is required hereunder to register
Registrable Shares, it shall also do the following:

     (a)  Furnish to each Selling Shareholder such copies of each preliminary
and final prospectus and such other documents as said holder may reasonably
request to facilitate the public offering of its Registrable Shares;

<PAGE>

     (b)  Use its best efforts to register or qualify the Registrable Shares
covered by said registration statement under the applicable securities or "blue
sky" laws of such jurisdictions as shall be reasonably appropriate to effect
distribution;

     (c)  Furnish to each Selling Shareholder a signed counterpart of: (i) an
opinion of counsel for the Company dated the effective date of the registration
statement and addressed to the Selling Shareholders; and (ii) "comfort" letters
addressed to the Selling Shareholders and signed by the Company's independent
public accountants who have examined and reported on the Company's financial
statements included in the registration statement; in each case covering
substantially the same matters with respect to the registration statement (and
the prospectus included therein) and (in the case of the accountants' "comfort"
letters) with respect to events subsequent to the date of the financial
statements, as are customarily covered in opinions of issuer's counsel and in
accountants' "comfort" letters delivered to the underwriters in underwritten
public offerings of securities, to the extent that the Company is required to
deliver or cause the delivery of such opinion or "comfort" letters to the
underwriters in an underwritten public offering of securities;

     (d)  Permit each Selling Shareholder or his counsel or other
representatives to inspect and copy such corporate documents and records as may
reasonably be requested by them;

     (e)  Furnish to each Selling Shareholder a copy of all documents filed and
all correspondence from or to the Commission in connection with any such
offering; and

     (f)  Obtain all necessary approvals from the National Association of
Securities Dealers, Inc.

SECTION 13. EXPENSES. In the case of a registration under Section 2, 3 or 4, the
Company shall bear all costs and expenses of each such registration, including,
but not limited to, printing, legal and accounting expenses, Commission filing
fees and "blue sky" fees and expenses; provided, however, that the Company shall
have no obligation to pay or otherwise bear (i) any portion of the fees or
disbursements of more than one counsel for the holders of Registrable Shares in
connection with the registration and sale of their Registrable Shares or (ii)
any portion of the underwriters' commissions or discounts attributable to the
Registrable Shares being offered and sold by the holders of Registrable Shares.

SECTION 14. LOCKUP AGREEMENT. In consideration of the Company's execution of
this Agreement, each holder of Registrable Shares severally and not jointly
agrees that, in connection with the Company's Initial Public Offering and, upon
request of the managing underwriters thereof, such holder will not sell, make
any short sale of, loan, grant any option for the purpose of, or otherwise
dispose of any Registrable Shares (other than those included in the
registration) without the prior written consent of the managing underwriters,
for such period of time (not to exceed 180 days) from the effective date of the
registration as the underwriters may specify.

SECTION 15. UNDERWRITING AGREEMENT. In the event that Registrable Shares are
sold in an underwritten offering pursuant to Section 3 or 4, the Company agrees
to enter into an underwriting agreement containing customary representations and
warranties with

<PAGE>

respect to the business and operations of an issuer of securities being
registered and customary covenants and agreements to be observed and performed
by such issuer, including without limitation customary provisions with respect
to indemnification by the Company of the underwriters of such offering.

SECTION 16.  RULE 144 REQUIREMENTS. The Company shall:

     (a)  make and keep public information available, as those terms are
understood and defined in Rule 144 under the Securities Act, at all times from
and after 90 days following the effective date of the first registration under
the Securities Act filed by the Company for an offering of its securities to the
general public, and for so long as the Company is subject to the reporting
requirements of Section 13 or 15(d) of the Exchange Act;

     (b)  use its best efforts to file with the Commission in a timely manner
all reports and other documents required of the Company under the Securities Act
and the Exchange Act (at any time after it has become subject to such reporting
requirements); and

     (c)  furnish to any holder of Registrable Shares upon request a written
statement by the Company as to its compliance with the reporting requirements of
Rule 144 (at any time from and after 90 days following the effective date of the
first registration statement filed by the Company for an offering of its
securities to the general public), and of the Securities Act and the Exchange
Act (at any time after it has become subject to such reporting requirements), a
copy of the most recent annual or quarterly report of the Company, and such
other reports and documents of the Company as such holder may reasonably request
to avail itself of any rule or regulation of the Commission allowing it to sell
any such securities without registration.

SECTION 17.  NO WAIVER; CUMULATIVE REMEDIES. No failure or delay on the part of
any party to this Agreement in exercising any right, power or remedy hereunder
shall operate as a waiver thereof; nor shall any single or partial exercise of
any such right, power or remedy preclude any other or further exercise thereof
or the exercise of any other right, power or remedy hereunder. The remedies
herein provided are cumulative and not exclusive of any remedies provided by
law.

SECTION 18.  AMENDMENTS, WAIVERS AND CONSENTS. Except as hereinafter provided,
changes in or additions to this Agreement may be made, and compliance with any
covenant or provision set forth herein may be omitted or waived, only with the
written consent of the Company and the holder or holders of not less than 66
2/3% of the Registrable Shares (calculated on an as-if converted basis). Copies
of such written consents shall be delivered to any Holder who did not execute
such consent. No consents shall be effective to reduce the percentage of
Registrable Shares the consent of the Holders of which is required under this
Section, and no amendment or change may be made to the terms of this Agreement
that imposes additional obligations or restrictions on a party hereto, without
its written consent. Any waiver or consent may be given subject to satisfaction
of conditions stated therein, and any waiver or consent shall be effective only
in the specific instance and for the specific purpose for which given.

SECTION 19.  ADDRESSES FOR NOTICES. Any notice or demand or other communication
which, by any provision of this Agreement or any agreement, document or
instrument

<PAGE>

executed pursuant hereto, except as otherwise provided therein, is required or
provided to be given shall be deemed to have been sufficiently given or served
for all purposes if facsimile transmitted or personally delivered, or if sent by
certified or registered mail, return receipt requested, postage and charges
prepaid, or by an overnight delivery service, charges prepaid, at the addresses
set forth in Schedule 1 or at such other address as to which any party hereto
may inform the other parties in writing in compliance with the terms of this
Section; and if to the Company, to the Chief Executive Officer at the address
first set forth above with a copy to Kirkpatrick & Lockhart LLP, 75 State
Street, Boston, Massachusetts 02109 Attn: Michael A. Hickey, Esq. All such
notices and other communications shall be effective when personally delivered
or, when mailed, four days after deposit in the mails, or one day after delivery
to an overnight courier, addressed as aforesaid, unless otherwise provided
herein.

SECTION 20.  BINDING EFFECT; ASSIGNMENT. This Agreement shall be binding upon
and inure to the benefit of the Company and the Holders and their respective
heirs, successors and assigns.

SECTION 21.  PRIOR AGREEMENTS. This Agreement constitutes the entire agreement
between the parties and supersedes any prior understandings or agreements, oral
or written, concerning the subject matter hereof.

SECTION 22.  SEVERABILITY. The provisions of this Agreement are severable and,
in the event that any court of competent jurisdiction shall determine that any
one or more of the provisions of this Agreement, or any portion thereof, is
invalid, illegal or unenforceable in any respect, such invalidity, illegality or
unenforceability shall not affect any other provisions of this Agreement, but
this Agreement shall be construed as if such invalid or illegal or unenforceable
provision, or part of a provision, had never been contained herein, and the
remaining provisions shall be valid, legal and enforceable to the maximum extent
possible.

SECTION 23.  GOVERNING LAW. This Agreement shall be governed by, and construed
in accordance with, the internal laws of the State of Delaware, and without
giving effect to choice of laws provisions.

SECTION 24.  HEADING. Article, section and subsection headings in this Agreement
are included herein for convenience of reference only and shall not constitute a
part of this Agreement for any other purpose.

SECTION 25.  COUNTERPARTS. This Agreement may be executed in any number of
counterparts, all of which taken together shall constitute one and the same
instrument, and any of the parties hereto may execute this Agreement by signing
any such counterpart.

SECTION 26.  ADDITIONAL PARTIES. The Company may issue additional shares of
Series E Preferred to persons or entities not initially parties to this
Agreement. Each Additional Series E Holder shall execute a counterpart of this
Agreement and upon such execution, this Agreement, including Schedule 1 hereto
which shall be modified accordingly and distributed to each Holder hereunder,
shall be deemed to have been amended to add such additional Series E Holder as a
party hereto with all rights and obligations of the other Holders hereunder.

<PAGE>

SECTION 27.  FURTHER ASSURANCES. From and after the date of this Agreement,
upon the request of any Investor or the Company, the Company and the Investors
shall execute and deliver such instruments, documents and other writings as may
be reasonably necessary or desirable to confirm and carry out and to effectuate
fully the intent and purposes of this Agreement.<PAGE>

                                                                    Exhibit 4.13

          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.

WE-1                                                                [____], 2002

                          Common Stock Purchase Warrant
                                       of
                           Spectra Systems Corporation

1.   Warrant Right. Spectra Systems Corporation, a Delaware corporation (the
"Company"), hereby certifies that, for value received, [____] (the "Holder"), or
his 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 15, 2007, (the "Expiration Date"): [____]
fully paid and non-assessable shares of Common Stock, par value $0.01 (the
"Warrant Number"), at a purchase price per share of US$5.75 (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.

     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

                                             Warrant to Purchase Common Stock- 1

<PAGE>

     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 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.

                                             Warrant to Purchase Common Stock- 2

<PAGE>

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.

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

                                             Warrant to Purchase Common Stock- 3

<PAGE>

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.

10.  Transfer of Warrant. 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.

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.

                                             Warrant to Purchase Common Stock- 4

<PAGE>

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 Systems Corporation, with regard to comparable sales of
and other transactions relating to the Company's securities.

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.

                                             Warrant to Purchase Common Stock- 5

<PAGE>

Executed under seal as of the date first written above.

                                      SPECTRA SYSTEMS CORPORATION

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

                                             Warrant to Purchase Common Stock- 6

<PAGE>

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

                           SPECTRA SYSTEMS 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 Systems
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 SYSTEMS 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 Systems 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 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)

                                             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"}]]