Document:

Exhibit 10.65

 Exhibit 10.65 
  
 Old Dominion Electric Cooperative 
 Option Agreement 
  
 THIS AGREEMENT is between Old Dominion Electric Cooperative (the “Cooperative”) and KONSTANTINOS N. KAPPATOS (the “Optionee”), and is dated as of March
1, 2002 (the “Date of Grant”). 
  
 The Cooperative hereby grants the Optionee an option to purchase shares
of mutual funds selected by the Board, subject to the terms and conditions of this Agreement. 
  
 The grant of this
Option is made pursuant to the Old Dominion Electric Cooperative 2002 Option Plan (the “Plan”), a copy of which has been provided to the Optionee, receipt of which is hereby acknowledged. The terms of the Plan are incorporated into this
Agreement by reference. In the case of any inconsistency between the Plan and this Agreement, the terms of the Plan shall control. Any term used in this Agreement that is defined in the Plan shall have the same meaning given to that term in the
Plan. 
  
 1.  Grant of Option. 
  
 (a)  The Cooperative grants the Optionee a nonstatutory stock option (the “Option”) to purchase from the Cooperative option shares (the
“Shares”) listed in Appendix A to this Agreement. The price paid by the Optionee to exercise the Option shall be equal to twenty-five percent (25%) of the total vested Option Value (as defined in the Plan) as of the applicable vesting date
listed in Section 2(a). The total Option Value assigned to this Option is $408,000. The Optionee will become vested in the Option Value pursuant to Section 2 of this Agreement. 
  
 (b)  The grant of this Option shall not obligate the Cooperative to pay the Optionee any particular amount of remuneration, to continue the employment of the
Optionee after the grant or to make further grants to the Optionee at any time thereafter. 
  
 2.  Entitlement to Exercise Option. 
  
 (a)  The Optionee must be
an employee of the Cooperative on the applicable vesting date listed below in order to become vested in his Option Value. The Optionee will become vested in the Option Value as follows: 
  
 
	 Vesting Date
 
	  	 Vested Option Value
 
	  	 Total Vested
 Option Value
 

	   March 1, 2002
 	  	 $102,000
 	  	 $102,000
 
	 January 1, 2003
 	  	 $102,000
 	  	 $204,000
 
	 January 1, 2004
 	  	 $102,000
 	  	 $306,000
 
	 January 1, 2005
 	  	 $102,000
 	  	 $408,000
 

 
  
 This vesting schedule shall accelerate and the Option shall become
fully exercisable upon the first to occur of (i) a “Change in Control,” (ii) the Optionee’s “Disability,” or (iii) the 

  
 Optionee’s death. For purposes of this Agreement, the terms “Change in Control” and
“Disability” shall have the same meaning, and shall be interpreted in the same manner, as the definition of those terms used in the Executive Severance Agreement between the Optionee and the Cooperative, dated as of January 1, 2000.

  
 (b)  Except as otherwise stated in this paragraph, the Option may be exercised on or after the date the
Optionee both (x) has attained retirement age pursuant to the Cooperative’s retirement age policy in effect as of the date the Optionee terminates employment, and (y) has terminated employment with the Cooperative. 
  
 (i)   If the Optionee retires or ceases to be employed by the Cooperative for any reason, including a
termination because of his death or Disability and at a time when all or a portion of this Option was vested pursuant to paragraph (a) above, the Optionee (or his beneficiary or personal representative) may exercise any or all of his vested Option
within fifteen (15) years after the Date of Grant. 
  
 (ii)  If the Optionee is terminated
by the Cooperative for Cause (as defined in the Plan), this Option will expire immediately (with respect to both the vested and unvested Option Value) as of the date of the misconduct. 
  
 (c)  In no event may this Option be exercised after the fifteenth (15th) anniversary of the Date of Grant. 
  

3.  Method of Exercise and Payment. 
  
 (a)  The Optionee may exercise his Option by delivering a written notice to the Record Keeper in the form attached as Exhibit A. Exercise of the Option may be made only within the 10 business
days before the end of a calendar quarter. The exercise date will be (i) in the case of notice by mail, the date of postmark; or (ii) if delivered in person, the date of delivery. The notice must be signed and state the number of shares the Optionee
has elected to purchase. The Optionee may exercise the Option in whole or in part, but only with respect to whole shares of stock. 
  
 (b  The exercise notice must be accompanied by payment of the Option Price in full by cash (which shall include payment by check, bank draft or money order payable to the Cooperative). Instead of paying cash, the
Optionee may agree to surrender Shares being acquired for all or part of the cash payment (for this purpose, Shares will be valued at their Fair Market Value on the date of exercise). 
  
 4.  Tax Obligations Upon Exercise.    The difference between the Fair Market Value of the shares purchased when this Option is
exercised and the Option price is compensation taxable to the Optionee as ordinary income and is subject to applicable federal and state taxes. By signing the Agreement, the Optionee agrees to make arrangements satisfactory to the Cooperative to
comply with applicable tax withholding requirements, if any. 

 
 2 

 5.  Nontransferability.    In general, this Option shall not be transferable by the
Optionee other than by will or by the laws of descent and distribution. Notwithstanding the preceding sentence and subject to federal and state securities laws, the Optionee may transfer this all or a portion of this Option to one or more immediate
family members, to a trust for the benefit of immediate family members, or to a partnership, limited liability company, or other entity the only partners, members, or interest-holders of which are among the Optionee’s immediate family members.
Consideration may not be paid for the transfer of this Option. 
  
 6.  Adjustments.    If the number of outstanding shares of mutual fund Shares is increased or decreased as a result of a subdivision or consolidation of shares, the payment of a stock dividend,
stock split, or any other change in capitalization, the number of unexercised Option Shares and the Option Price shall be appropriately adjusted by the Cooperative, whose determination shall be binding. 
  
 7.  Employment Rights.    Neither the Plan nor this Agreement confers upon the Optionee any
right to continue as an employee of the Cooperative or limits in any respect the right of the Cooperative to terminate the Optionee’s employment. 
  
 8.  Limitation of Liability. 
  
 (a)  The
Optionee agrees that the Cooperative and its Members’ officers, directors, employees, agents, licensors, contractors, or representatives will not be liable for any incidental, indirect, special, exemplary or consequential damages, including but
not limited to, damages or costs incurred as a result of loss of time, loss of savings, loss of data, loss of profits, or loss of goodwill, whether foreseeable or unforeseeable, that may arise out of or in connection with this Agreement, and whether
such liability is based on contract, tort, negligence, strict liability, products liability or otherwise. 
  
 (b)  In no event will the collective liability of the Record Keeper and its affiliates for any damages incurred by the Optionee ever exceed the fees received by the Record Keeper under this Agreement during the twelve
months prior to the time at which the damages arose regardless of the form of action, whether based on contract, tort, negligence, strict liability, products liability or otherwise. 
  
 9.  Governing Law.    This Agreement shall be governed by the laws of the Commonwealth of Virginia. 
  
 10.  Acceptance of Option.    This Agreement deals only with the Option the Optionee has been granted
and not its exercise. The Optionee’s acceptance of the Option places no obligation or commitment on the Optionee to exercise the Option. By signing below, the Optionee indicates acceptance of the Option and his or her agreement to the terms and
conditions set forth in this Agreement, which, together with the terms of the Plan, shall become the Cooperative’s Stock Option Agreement with the Optionee. The Optionee also acknowledges receipt of a copy of the Plan and agrees to all of the
terms and conditions of the Plan. 
 

 3 

 11.  Entire Agreement, Amendment.    This Agreement constitutes the entire agreement
between the Optionee and the Cooperative with respect to the Option granted herein and shall be binding upon your legatees, distributees, and personal representatives and the successors of the Cooperative. This Agreement may only be amended by a
writing signed by both the Optionee and the Cooperative. 
  
 
	 OLD DOMINION ELECTRIC COOPERATIVE
 
	 
	 By:
 	 	 /s/  VERNON N. BRINKLEY
 

	  	 	 Vernon N. Brinkley
 Chairman of
the Board
 
	 
	 Date:
 	 	 March 1, 2002
 

	  
 KONSTANTINOS N. KAPPATOS 
 
	 
	 Signature:
 	 	 /s/ K. N. KAPPATOS
 

	 
	 Date:
 	 	 March 1, 2002
 

 

 
 4 

 

                                                                     Appendix A

                              Option Strategy Plan

                               Investment Options

 

 

[ ]  Understanding Your Investment Options
--------------------------------------------------------------------------------

Controlling your investments is an important feature of the Palmer & Cay Option
Strategy Plan (PCOS). For that reason, investment alternatives with varying
degrees of risk and reward are available.

This packet provides the information you need to make informed investment
decisions. It's important to review the performance of your investments and your
investment strategy on a regular basis.

The company provides alternative investment funds to allow you:

        o  To create an investment program that is responsive to your particular
           financial goals and needs
        o  The opportunity to affect your investment return and control the risk
           of loss

Keep in mind that this brochure provides general educational information; it
does not in any way constitute specific investment advice. For advice about how
to invest, contact a professional financial advisor. Also, before you invest in
any fund, you should read the prospectus and other descriptive material provided
by each fund, available through your employee benefits department.

Other Information Available to You

Contact your employee benefits department if you would like a copy of:

        o  Prospectuses on the Plan's investment options
        o  Copies of financial statements, to the extent that they are available
        o  Information on underlying assets
        o  Share value of investment alternatives

Please note that some funds may have voting rights for issues like the election
of directors and selection of auditors. These rights are exercised on behalf of
this Plan by its trustees and are not available to participants.

Changing Your Investments

You may make changes to how your account is invested, including:

        o  Where you invest future contributions
        o  How past contributions are invested, by transferring or realigning
           your existing assets

If you want to make changes, contact your employee benefits department. Changes
are made as soon as administratively possible after requests are received. Check
plan highlights for how often changes are permitted.

--------------------------------------------------------------------------------
Palmer & Cay Investment Services, Inc.                                         1

 

 

[ ]  Your Investment Program

--------------------------------------------------------------------------------

Risk Versus Return

The PCOS Plan offers a broad range of investment funds selected to help you meet
your investment needs. All of the fund strategies are shown on the risk and
return graph below. You can see that the Schwab Money Market Fund has the lowest
expected return and lowest level of risk. On the other hand, the Rockland Small
Cap Growth Fund has the highest expected return and highest level of risk.

    |
    |                        Aggressive       [ ] Rockland Small Cap Growth
    |
    |
    |                                    [ ] Artisan International
    |
    |
    |               Moderate          [ ] Managers Capital Appreciation
    |
    |
Risk|                            [ ] Ameristock
    |
    | Conservative
    |
    |                       [ ] Met West Total Return
    |
    |                 [ ] Schwab Money Market
    |---------------------------------------------------------------------------
                                     Reward

[ ]  Fund Performance

--------------------------------------------------------------------------------

     Information and Performance from Morningstar as of September 30, 2001

                                Morningstar     Prospectus       Morningstar                         Annualized     Expense   Mgr
Fund Name                       Category        Objective        3 Yr Rating  Month    YTD    1 Year 3 Year  5 Year  Ratio   Tenure
-----------------------------------------------------------------------------------------------------------------------------------
Schwab Money Market             Money Market    Capital              -         0.24    3.20    4.75   4.97    4.99    0.75
Salomon Smith Barney 3 Month                      Preservation
  T-Bill Index                                                                 0.90    3.41    5.03   5.12    5.16

Metropolitan West Total Return  Intermediate-   Corp Bond-           5         4.01    9.42   12.15   8.13     -      0.65    4.00
Lehman Brothers Aggregate         term Bond       General
  Bond Index                                                                   4.62    8.38   12.95   6.38    8.06

Ameristock                      Large Value     Equity Income        4       (10.10)  (5.74)   0.43  11.65   17.73    0.99    6.00
Russell 1000 Value Index                                                     (10.96) (12.08)  (8.91)  5.61   11.67

Managers Capital Appreciation   Large Growth    Growth               3       (20.58) (41.29) (55.42)  6.76   11.48    1.30    2.00
Russell 1000 Growth Index                                                    (19.41) (30.89) (45.64) (3.28)   6.50

Rockland Small Cap Growth       Small Growth    Aggressive Growth    5        (8.06) (28.92) (41.94) 27.82     -      1.53    4.00
Russell 2000 Growth Index                                                    (28.09) (28.06) (42.59) (0.43)  (1.75)

Artisan International           Foreign Stock   Foreign Stock        5       (14.08) (23.38) (27.17) 15.75   13.31    1.22    6.00
MSCI EAFE Index                                                              (14.00) (26.56) (28.53) (1.16)  (0.14)

Note: This performance information has been prepared by Palmer & Cay Investment
Services, Inc. (PCIS) from data gathered primarily from Morningstar, Inc. While
the data gathered for use are considered to be from reliable sources, PCIS
cannot guarantee its completeness or its accuracy. In addition, past performance
should not be construed as a guarantee of future performance. Anyone using this
information to determine suitability of the represented fund for investment
purposes is strongly advised to read the fund prospectus before investing.

--------------------------------------------------------------------------------
Palmer & Cay Investment Services, Inc.                                         2

 

 

[ ]  The Fund Program

--------------------------------------------------------------------------------

How Funds Compare

The fund or funds you choose will depend on your personal investment objectives.
The key to smart financial planning is to match your investment objectives to
the funds' investment objectives. The following chart provides a comparison of
the six options.

Investment            Fund Objective               Risk/Reward                                    This Fund Invests in...
Strategy (Fund)
------------------------------------------------------------------------------------------------------------------------------------
Money Market           Seeks current income      Should provide the least amount of               A short-term investment fund
(Schwab Money          and capital               investment risk over the short-term;             invested in money market
Market)                preservation              however, over longer periods of time, the        instruments.
                                                 investment income generated by the fund
                                                 often has been only moderately higher than
                                                 the rate of inflation.
------------------------------------------------------------------------------------------------------------------------------------
Bonds                  Seeks high current        Should provide current income with some          A diversified portfolio of fixed
(Metropolitan West     income and long-term      capital appreciation consistent with an          income securities of varying
Total Return)          total return              actively managed bond portfolio.                 maturities issued by domestic and
                                                                                                  foreign corporations and
                                                                                                  governments.  At least 80% of
                                                                                                  assets will be invested in
                                                                                                  investment grade securities.
------------------------------------------------------------------------------------------------------------------------------------
Value Equity           Seeks capital             Should provide more stability than growth        The common stocks of primarily
(Ameristock)           appreciation and          funds.  Emphasis on value and stability          domestic large capitalization
                       current income            could prevent the Fund from achieving high       companies that pay dividends.  In
                                                 returns in growth rallies.                       addition, maintaining a value
                                                                                                  focus, the companies usually have
                                                                                                  low P/E's and high dividend
                                                                                                  yields.
------------------------------------------------------------------------------------------------------------------------------------
Growth Equity          Seeks long-term           Growth emphasis makes the Fund more              The common and preferred stocks
(Managers Capital      capital appreciation      volatile than value equity. Should provide       of medium and large domestic
Appreciation)          from equity               high returns during growth rallies but could     companies that are expected to
                       securities.               lag during market down turns.                    grow at accelerated or sustained
                                                                                                  levels.
------------------------------------------------------------------------------------------------------------------------------------
International          Seeks long-term           More volatile than a domestic equity fund        Common stocks of non-US
Equity                 growth with little        because of currency and country risk and         companies with superior earnings
(Artisan               regard for current        growth emphasis.  Long-term performance          growth in developed and emerging
International)         income.                   should be better than domestic equity funds.     countries.
------------------------------------------------------------------------------------------------------------------------------------
Small-Cap Equity       Seeks aggressive          Should provide higher long-term return than      Common stocks of small
(Rockland Small        long-term growth of       international equity, but at more                companies that have expanding
Cap Growth)            capital by investing      short-term risk.                                 profit margins and whose earnings
                       primarily in the                                                           have far exceeded Wall Street's
                       common stocks of                                                           expectations.  Management
                       small sized                                                                attempts to capitalize on market
                       companies.                                                                 trends.
------------------------------------------------------------------------------------------------------------------------------------

Note: Keep in mind that returns on any fund may vary from month to month and may
include both gains and losses to your account. While the potential return on
investment is greater in the equity funds than in the bond and money market
funds, the risk is also greater. However, equity funds typically produce larger
total investment returns than bond and money market funds when the returns are
compounded over a five- to ten-year period.

--------------------------------------------------------------------------------
Palmer & Cay Investment Services, Inc.                                         3

 

 

[ ]  Model Portfolios

--------------------------------------------------------------------------------

Constructing Your Own Portfolio

You may choose from six different funds to construct your own portfolio. You may
invest your assets in multiples of any whole number totaling 100%. Following are
three different portfolio models that you may use as a guide to construct your
own portfolio. Each reflects a different investment philosophy and strategy. In
reviewing the models, please understand that the company does not suggest any of
these models are necessarily appropriate for you or any other participant.

Conservative Model                            Moderate Model                              Aggressive Model
This model is for participants who are        This model is for participants who are      This model is for participants who are
seeking current income, have a low            seeking growth opportunities at moderate    seeking strong growth opportunities and
tolerance for risk and want to preserve       risk. By combining the strong growth        have a higher level of risk tolerance. It
the value of their fund while still           qualities of stocks with the lower risk     allows investors the potential for the
maintaining the possibility for some          profile of bonds and money market funds,    high return generated by a diversified
growth.                                       this model rewards investors with           array of equity classes, including small-
                                              moderate growth characteristics at          cap and international.
                                              moderate risk.

[Graph appears here]                          [Graph appears here]                        [Graph appears here]

Allocation by fund:                           Allocation by fund:                         Allocation by fund:
Ameristock                         10%        Ameristock                        20%       Ameristock                           25%
Managers Capital Appreciation      10%        Managers Capital Appreciation     20%       Managers Capital Appreciation        25%
Rockland Small Cap Growth           5%        Rockland Small Cap Growth         10%       Rockland Small Cap Growth            15%
Artisan International               5%        Artisan International             10%       Artisan International                15%
Metropolitan West Total Return     30%        Metropolitan West Total Return    30%       Metropolitan West Total Return       15%
Schwab Money Market                40%        Schwab Money Market               10%       Schwab Money Market                   5%

Allocation by style:                          Allocation by style:                        Allocation by style:
Equities                                      Equities                                    Equities
--------                                      --------                                    --------
Large Value                        10%        Large Value                       20%       Large Value                          25%
Large Growth                       10%        Large Growth                      20%       Large Growth                         25%
Small Cap Growth                    5%        Small Cap Growth                  10%       Small Cap Growth                     15%
International                       5%        International                     10%       International                        15%
Fixed Income                                  Fixed Income                                Fixed Income
------------                                  ------------                                ------------
Core                               30%        Core                              30%       Core                                 15%
Cash                               40%        Cash                              10%       Cash                                  5%

Allocation by asset class:                    Allocation by asset class:                  Allocation by asset class:
Money market instruments           40%        Stocks                            60%       Stocks                              100%
Stocks                             30%        Money market instruments          10%
Bonds                              30%        Bonds                             30%

--------------------------------------------------------------------------------
Palmer & Cay Investment Services, Inc.                                         4

 

 

                        Old Dominion Electric Cooperative

                      Executive Option Plan Enrollment Form

--------------------------------------------------------------------------------
Participant Information
--------------------------------------------------------------------------------

Participant:                                           SSN:
            --------------------------------------------------------------------

Address:                                   City:         State / ZIP:
        -----------------------------------     ---------            -----------

Option Grant Number:                       Work Phone:

--------------------------------------------------------------------------------

  As a Participant of the Executive Option Plan, I elect to allocate the
  underlying investment in the following securities. I understand that I may
  reallocate my investments under this Plan on a quarterly basis and I agree to
  not hold Old Dominion Electric Cooperative liable for market fluctuations
  resulting in loss of principal and interest.

                            Fund Allocation Selection

--------------------------------------------------------------------------------
                                              Investment     Allocation
Fund Name                           Ticker    Strategy       Percentage
                                                             (In 10% Increments)
--------------------------------------------------------------------------------
Metropolitan West Total Return      MWTRX     Conservative                     %
--------------------------------------------------------------------------------
Schwab Money Market                 SWMXX     Conservative                     %
--------------------------------------------------------------------------------
Ameristock                          AMTX      Moderate                         %
--------------------------------------------------------------------------------
Managers Capital Appreciation       MGCAX     Moderate                         %
--------------------------------------------------------------------------------
Artisan International               ARTIX     Aggressive                       %
--------------------------------------------------------------------------------
Rockland Small Cap Growth           RKGRX     Aggressive                       %
--------------------------------------------------------------------------------
                                                                      ----------
                                                                            100%
                                                                      ----------

Participants Signature: _____________________________     Date: ________________

By signing this enrollment form, I have acknowledged receipt of prospectuses for
each of the above funds.

--------------------------------------------------------------------------------
Palmer & Cay Investment Services, Inc.                                         5

 

 

                                                                       Exhibit A

                                                             [PALMER & CAY LOGO]

                        OLD DOMINION ELECTRIC COOPERATIVE
                         2002 Option Plan Exercise Form

--------------------------------------------------------------------------------------------------------------
                                     Personal Information
--------------------------------------------------------------------------------------------------------------
Company Name:                                                 Work Phone:
             -------------------------------------------------           -------------------------------------
Participant's Name:                                           Home Phone:
                   -------------------------------------------           -------------------------------------
Number of Options to be exercised:                   Grant Number:               Option Price:
                                  -------------------             ---------------             ----------------
--------------------------------------------------------------------------------------------------------------

                    COMPLETE ONE OF THE FOLLOWING TWO BOXES
                             ---
--------------------------------------------------------------------------------
                           Exercise Method - Cashless
--------------------------------------------------------------------------------

|_| Check here if you wish to use the cashless method to settle exercise cost
    and applicable tax.

Complete Cash-out - All private options will be exercised and shares immediately
sold on the market. You will receive the net proceeds in cash less the amount to
cover the exercise price and the applicable federal, state and FICA taxes.

--------------------------------------------------------------------------------

                                       OR

--------------------------------------------------------------------------------
                             Exercise Method - Cash
--------------------------------------------------------------------------------

|_| Check here if you wish to use the cash method to settle exercise cost and
    applicable taxes.

A check, made payable to _______________, for the exercise price of the private
options must accompany this form.

|_|   Check - Immediately following the exercise, you will be notified of an
      additional amount needed to cover the applicable federal, state and
      FICA taxes. A check is immediately due upon notification. If the check
      is not received within 30 days, taxes will be taken from your next
      paycheck.

--------------------------------------------------------------------------------

Participant's Signature: _____________________      Date: ______________________

Administrator's Confirmation: ________________      Date: ______________________

NOTE: Exercise date will be deemed to be the Participant Signature Date.
However, market values of underlying mutual funds are likely to fluctuate from
the exercise date to the date of sale. By signing above, the Participant agrees
the Old Dominion Electric Cooperative shall not be held responsible for those
market fluctuations.<PAGE>

                                                                    EXHIBIT 4.1

            FOURTH AMENDED AND RESTATED REGISTRATION RIGHTS AGREEMENT

     This FOURTH AMENDED AND RESTATED REGISTRATION RIGHTS AGREEMENT dated as of
September 1, 2000 is entered into by and among Spectra Science Corporation, a
Delaware corporation with principal offices at 321 South Main Street, Suite 102,
Providence, Rhode Island 02903 (the "Company"), and the persons or entities
listed as Holders, including the persons and entities identified as Series A
Holders, Series B Holders, Series C Holder, and Series D Holders on Exhibit A
hereto as such Exhibit A may be amended in the future to include additional
investors (individually, a "Holder," and collectively, the "Holders").

     A. The Series D Holders (a) are parties to (i) the Series D Convertible
Stock Purchase Agreement of even date herewith (the "Series D Purchase
Agreement") by and among the Company and the Series D Holders pursuant to which
the Series D Holders have purchased shares of the Company's Series D Convertible
Preferred Stock ("Series D Shares"), or (ii) the Stock Purchase Agreement dated
September 23, 1998, by and among the Company and the Series D Holders, as
amended (the "Original Series D Purchase Agreement").

     B. The Series C Holder is a party to the Series C Convertible Preferred
Stock Purchase Agreement dated as of November 7, 1997 (the "Series C Purchase
Agreement") by and among the Company and the Series C Holder pursuant to which
the Series C Holder has purchased shares of the Company's Series C Convertible
Preferred Stock ("Series C Shares").

     C. The Series B Holders are parties to the Series B Convertible Preferred
Stock Purchase Agreement dated as of July 25, 1997 (the "Series B Purchase
Agreement") by and among the Company and the Series B Holders pursuant to which
the Series B Holders have purchased shares of the Company's Series B Convertible
Preferred Stock ("Series B Shares").

     D. The Finder's Warrants are the warrants issued under the Series B
Purchase Agreement as part of the finder's fee to Pillar Investment Limited and
Clearwater Funds IV LP for referral of purchasers to the Company thereunder.

     E. The Series A Holders are parties to the Series A Convertible Preferred
Stock Purchase Agreement dated as of August 23, 1996 (the "Series A Purchase
Agreement") by and among the Company and the Series A Holders pursuant to which
the Series A Holders purchased shares of the Company's Series A Convertible
Preferred Stock (the "Series A Shares").

     F. Pursuant to the Series A Purchase Agreement, the Series B Purchase
Agreement, and the Series C Purchase Agreement, the Company, the Series A
Holders, the Series B Holders and the Series C Holder entered into a Second
Amended and Restated Registration Rights Agreement (the "Second Amended and
Restated Registration Rights Agreement") dated as of November 7, 1997, and
amended the same on September 23, 1998 (the "Third Amended and Restated
Registration Rights Agreement').

     G. The obligations of the Company and the Series D Holders under the Series
D Purchase Agreement are conditioned upon, among other things, the execution and
delivery of this Agreement by the Holders and the Company, with the intention
that this Agreement constitute an amendment and restatement of and supersede in
its entirety the Third Amended and Restated Registration Rights Agreement,
effective as of the date hereof.

<PAGE>

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

     1.1  "Closing Date" means the first closing date for sale of the Series D
Preferred under the Series D Purchase Agreement.

     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, $.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 $10,000,000 and in which the price
per share of Common Stock offered to the public equals or exceeds $7.00 (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  "Series A Purchase Agreement" means the Series A Convertible Preferred
Stock Purchase Agreement dated as of August 23, 1996 among the Company and the
investors referenced therein.

     1.9  "Series B Purchase Agreement" means the Series B Convertible Preferred
Stock Purchase Agreement dated as of July 25, 1997 among the Company and the
investors referenced therein.

     1.10 "Series C Purchase Agreement" means the Series C Convertible Preferred
Stock Purchase Agreement dated as of November 7, 1997 among the Company and the
investor referenced therein.

     1.11 "Series D Purchase Agreement" means the Series D Convertible Preferred
Stock Purchase Agreement of even date herewith among the Company and the
investors referenced therein.

                                      -2-

<PAGE>

     1.12 "Finder's Warrant Stock" means the shares of Series B Preferred Stock
issuable upon the exercise of the Finder's Warrants issued under the Series B
Purchase Agreement.

     1.13 "Purchased Shares" means shares of Series A Preferred Stock purchased
under the Series A Purchase Agreement, shares of the Series B Preferred Stock
purchased under the Series B Purchase Agreement, shares of the Series B Stock
issuable upon the exercise of the Finder's Warrants issued under the Series B
Purchase Agreement, shares of Series C Preferred Stock purchased under the
Series C Purchase Agreement, and shares of Series D Preferred purchased under
the Series D Purchase Agreement.

     1.14 "Holders" means the persons or entities listed in Exhibit A hereto who
execute a counterpart of this Agreement.

     1.15 "Registrable Shares" means (i) the shares of Common Stock issued and
issuable upon conversion of the Purchased Shares; (ii) the shares of Common
Stock acquired by Nabil Lawandy pursuant to the Founder Common Stock Purchase
Agreement dated August 21, 1996 between the Company and Mr. Lawandy; and (iii)
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.

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

     1.17 "Original Series D Purchase Agreement" means the Series D Stock
Purchase Agreement dated September 23, 1998, as amended.

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 first on the shares held by Mr. Lawandy, and then on a pro
rata basis among the holders of Common Stock (excluding Mr. Lawandy) 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

                                      -3-

<PAGE>

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 fifteen (15) days after the receipt by such holder from the Company
of such notification, the Company will use its best efforts to cause 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 effect a registration pursuant to this Section
3 unless such registration shall include Registrable Shares having an
anticipated fair market value of at least $1,000,000; (b) the Company shall not
be obligated to file a registration statement pursuant to this Section 3 during
the period beginning with the date sixty 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 sixty-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 (c) 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

                                      -4-

<PAGE>

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 one hundred eighty (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.

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 (i)
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 (ii) 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

                                      -5-

<PAGE>

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 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

                                      -6-

<PAGE>

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 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;

                                      -7-

<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; provided, however, that (i) such
holder shall have no obligation to enter into the agreement described herein
unless all executive officers and directors of the Company and all other holders
of more than 1% of the Company's then outstanding Common Stock (computed on an
as if converted basis, as to any outstanding convertible securities) enter into
similar agreements, and (ii) nothing herein shall prevent any holder of
Registrable Shares that is a partnership from making a distribution of
Registrable Shares to its affiliates that is otherwise in compliance with
applicable securities laws, if the transferees of the Registrable Shares shall
agree to be bound by the applicable provisions of this Section 14.

                                      -8-

<PAGE>

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 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.   Limitations on Subsequent Registration Rights. The Company shall
not, without the prior written consent of the holders of at least a majority of
the Registrable Shares then outstanding, enter into any agreement (other than
this Agreement) with any holder or prospective holder of any securities of the
Company which would allow such holder or prospective holder (a) to receive
registration rights on a parity with or on terms more favorable than those
granted herein or (b) to make a demand registration which could result in a
registration statement being declared effective prior to the effective date of a
Qualified Public Offering.

Section 17.   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 ninety (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 ninety (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 18.   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 19.   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

                                      -9-

<PAGE>

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 20.   Addresses for Notices. Any notice or demand or other communication
which, by any provision of this Agreement or any agreement, document or
instrument 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 Exhibit A 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 Kenneth S. Boger, Esq., Kirkpatrick
& Lockhart LLP, 75 State Street, Boston, Massachusetts 02109; and if to an
Investor (including any successor holder of the Purchased Shares), to the
address set forth on Exhibit A hereto.

         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 21.   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 22.   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 23.   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 24.   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 25.   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 26.   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.

                                      -10-

<PAGE>

Section 27.   Additional Parties. The Company may issue additional shares of
Series D Preferred to persons or entities not initially parties to this
Agreement under the terms of the Series D Purchase Agreement or pursuant to
payment by the Company of certain royalty obligations to Crane & Co., Inc. or
its assigns ("Additional Series D Holders"). Each Additional Series D Holder
shall execute a counterpart of this Agreement and upon such execution, this
Agreement, including Exhibit A hereto which shall be modified accordingly and
distributed to each Holder hereunder, shall be deemed to have been amended to
add such Additional Series D Holder as a party hereto with all rights and
obligations of the other Holders hereunder.

Section 28.   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.

Section 29.   Termination of the Third Amended and Restated Registration Rights
Agreement. The Third Amended and Restated Registration Rights Agreement is
hereby terminated and superseded in its entirety by this Agreement, effective as
of the date hereof, and the Third Amended and Restated Registration Rights
Agreement shall be of no further force or effect on or after the date hereof.

                            [signature page follows]

                                      -11-

<PAGE>

         IN WITNESS WHEREOF, the parties hereto have caused this Registration
Rights Agreement to be duly executed as of the day and year first written above.

                                            SPECTRA SCIENCE CORPORATION

                                            /s/ Nabil M. Lawandy
                                            ----------------------------
                                            Nabil Lawandy, President

                                      -12-

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