Document:

THE
      SECURITIES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE SECURITIES
      ACT
      OF 1933, AS AMENDED (“ACT”), AND MAY NOT BE SOLD, TRANSFERRED, ASSIGNED,
      PLEDGED, OR HYPOTHECATED ABSENT AN EFFECTIVE REGISTRATION THEREOF UNDER SUCH
      ACT
      OR COMPLIANCE WITH RULE 144 PROMULGATED UNDER SUCH ACT, OR UNLESS THE COMPANY
      HAS RECEIVED AN OPINION OF COUNSEL, SATISFACTORY TO THE COMPANY AND ITS COUNSEL,
      THAT SUCH REGISTRATION IS NOT REQUIRED.

    

    WARRANT
      TO PURCHASE COMMON STOCK

    OF

    QUINTESSENCE
      PHOTONICS CORPORATION

     

    
      	No. ___	
              Void
                after August 1, 2010

              (Unless
                extended per the terms
                below)

            

    

     

    This
      certifies that for good and valuable consideration previously provided to
      Quintessence Photonics Corporation, a Delaware corporation ("Company"),
      with
      principal offices currently at 15632 Roxford Street, Sylmar, California 91342,
      receipt of which is hereby acknowledged,
      ______________________________________________ is entitled, subject to the
      terms
      and conditions of this Warrant, to purchase from the Company at any time prior
      to 5:00 p.m. Pacific time on August 1, 2010 (such date, as may be extended
      pursuant to the terms hereof, the "Expiration
      Date"),
      up to
      that number of shares of Warrant Stock (as defined below) as may be purchased
      for the Maximum Purchase Amount (as defined below) at a price per share equal
      to
      the Warrant Price (as defined below), upon surrender of this Warrant at the
      principal offices of the Company, together with a duly executed subscription
      form in the form attached hereto as Exhibit 1
      and
      simultaneous payment of the full Warrant Price for the shares of Warrant Stock
      so purchased in lawful money of the United States. The Expiration Date, Warrant
      Price and the number and character of shares of Warrant Stock purchasable under
      this Warrant are subject to adjustment as provided herein.

    

    This
      Warrant is issued pursuant to that certain Loan Agreement dated as of August
      1,
      2005 (the "Purchase
      Agreement"),
      by
      and among the Company and the original holder of this Warrant, and is subject
      to
      the provisions thereof.

    

    1. Definitions.
      The
      following definitions shall apply for purposes of this Warrant:

    

    1.1 "Change
      of Control"
      means
      the consummation of any transaction or series of related transactions that
      results in the holders of record of the Company’s capital stock immediately
      prior to the transaction or transactions holding less than fifty percent (50%)
      of the voting power of the Company immediately after the transaction or
      transactions, including the acquisition of the Company by another entity and
      any
      reorganization, merger, consolidation or share exchange, or which results in
      the
      sale of all or substantially all of the assets of the Company; provided,
      however, that a Change of Control shall not be deemed to occur if a Successor
      succeeds to the business of the Company. 

    

    1.2 “Common
      Stock” means
      the
      common stock of the Company.

    

    1.3 "Company"
      means
      the "Company"
      as
      defined above and includes any corporation which shall succeed to or assume
      the
      obligations of the Company under this Warrant.

     

    
      
        
        

      

      
        
        

        
          

        

      

      
        
        

      

    

     

    1.4 “Early
      Termination Option”
means
      the Company’s option to terminate the extended term of the Note prior to its
      expiration date as provided in Section 4 of the Note.

    

    1.5 “Extension
      Option”
means
      the Holder’s option to extend the expiration date of the Note as provided in
      Section 4 of the Note.

    

    1.6 "Holder"
      means
      any person who shall at the time be the registered holder of this
      Warrant.

    

    1.7 "Initial
      Public Offering"
      means a
      firm commitment underwritten public offering pursuant to an effective
      registration statement filed under the Securities Act of 1933, as amended,
      covering the offer and sale of the Company's Common Stock to the public for
      the
      account of the Company.

    

    1.8 "Note"
      means
      the Secured Promissory Note of even date herewith initially payable to the
      initial Holder hereof.

    

    1.9 “Successor”
means
      (i) any entity that acquires all or substantially all of the assets or stock
      of
      the Company, or that results from the merger of, reorganization of, or
      consolidation with the Company, or otherwise succeeds to substantially all
      of
      the business of the Company, or (ii) in the case of a reverse merger in which
      the Company is the surviving entity, the Company; provided that the holders
      of
      record of the Company’s capital stock, in the aggregate, immediately prior to
      any of the foregoing transaction or series of related transactions shall possess
      at least 50% of the voting stock of such entity (or, in the case of a reverse
      merger, the Company) immediately after the transaction or
      transactions.

    

    1.10 "Warrant"
      means
      this Warrant and any warrant(s) delivered in substitution or exchange therefor,
      as provided herein.

    

    1.11 "Warrant
      Price"
      means
      $3.75 per share of Warrant Stock. The Warrant Price is subject to adjustment
      as
      provided herein.

    

    1.12 "Warrant Stock"
      means
      the Company’s Common Stock. The number and character of shares of Warrant Stock
      are subject to adjustment as provided herein and the term "Warrant
      Stock"
      shall
      include stock and other securities and property at any time receivable or
      issuable upon exercise of this Warrant in accordance with its
      terms.

    

    2. Exercise.

    

    2.1 Method
      of Exercise.
      Subject
      to the terms and conditions of this Warrant, the Holder may exercise this
      Warrant in whole or in part, at any time or from time to time, before the
      Expiration Date, for up to 62500
      shares
      of Warrant Stock (the “Maximum
      Purchase Amount”),
      by
      surrendering this Warrant at the principal offices of the Company, with the
      subscription form attached hereto duly executed by the Holder, and payment
      of an
      amount equal to the product obtained by multiplying (i) the number of shares
      of
      Warrant Stock to be purchased by the Holder by (ii) the Warrant Price or
      adjusted Warrant Price therefor, if applicable, as determined in accordance
      with
      the terms hereof.

    

    
      
        
        

      

      
        -2-

        
          

        

      

      
        
        

      

       

    

    2.2 Form
      of Payment.
      Payment
      may be made by (i) a check payable to the Company's order, (ii) wire transfer
      of
      funds to the Company, (iii) cancellation of indebtedness of the Company to
      the
      Holder, or (iv) any combination of the foregoing.

    

    2.3 Partial
      Exercise.
      The
      Warrant shall be exercisable, at the election of the holder thereof, either
      in
      full or from time to time in part and, in the event that the Warrant is
      exercised in respect of fewer than all of the Warrant Stock issuable on such
      exercise at any time prior to the date of expiration of the Warrant, the Company
      shall, at the time of delivery of such certificate, deliver to such holder
      a new
      Warrant to purchase the remaining Warrant Stock, which new Warrant shall in
      all
      other respects be identical with the Warrant exercised, or, at the request
      of
      such holder, appropriate notation may be made on the Warrant exercised and
      such
      Warrant shall be returned to such Holder.

    

    2.4 No
      Fractional Shares.
      No
      fractional shares may be issued upon any exercise of this Warrant, and any
      fractions shall be rounded down to the nearest whole number of shares. If upon
      any exercise of this Warrant a fraction of a share results, the Company will
      pay
      the cash value of any such fractional share, calculated on the basis of the
      Warrant Price.

    

    2.5 Restrictions
      on Exercise.
      This
      Warrant may not be exercised if the issuance of the Warrant Stock upon such
      exercise would constitute a violation of any applicable federal or state
      securities laws or other laws or regulations. As a condition to the exercise
      of
      this Warrant, the Holder shall execute the subscription form attached hereto,
      confirming and acknowledging that the representations and warranties of the
      Holder set forth in Section 3 of the Purchase Agreement are true and
      correct as of this date of exercise.

    

    2.6 Net
      Exercise Election.
      The
      Holder may elect to convert all or a portion of this Warrant, without the
      payment by the Holder of any additional consideration, by the surrender of
      this
      Warrant or such portion to the Company, with the net exercise election selected
      in the subscription form attached hereto duly executed by the Holder, into
      up to
      the number of shares of Warrant Stock that is obtained under the following
      formula:

    

    X
      =
Y
      (A-B)

        A         
      

    

    
      	
              where

            	
              X
                =

            	
              the
                number of shares of Warrant Stock to be issued to the Holder pursuant
                to
                this Section 2.6.

            

    

    

    
      	 	
              Y
                =

            	
              the
                Maximum Purchase Amount divided by the Warrant
                Price.

            

    

    

    
      	 	
              A
                =

            	
              the
                fair market value of one share of Warrant Stock, as determined in
                good
                faith by the Company's Board of Directors, as at the time the net
                exercise
                election is made pursuant to this Section
                2.6.

            

    

    

    
      	 	
              B
                =

            	
              the
                Warrant Price.

            

    

    

    The
      Company will promptly respond in writing to an inquiry by the Holder as to
      the
      then current fair market value of one share of Warrant Stock.

    

    3. Issuance
      of Stock.
      This
      Warrant shall be deemed to have been exercised immediately prior to the close
      of
      business on the date of its surrender for exercise as provided above, and the
      person entitled to receive the shares of Warrant Stock issuable upon such
      exercise shall be treated for all purposes as the holder of record of such
      shares as of the close of business on such date. As soon as practicable on
      or
      after such date, the Company shall issue and deliver to the person or persons
      entitled to receive the same a certificate or certificates for the number of
      whole shares of Warrant Stock issuable upon such exercise.

     

    
      
        
        

      

      
        -3-

        
          

        

      

      
        
        

      

       

    

    4. Early
      Expiration.
      If
      the
      Company proposes at any time to effect a Change of Control, the Company shall
      mail to the Holder a notice specifying the date on which the Change of Control
      is anticipated to become effective. The Company shall give Holder thirty (30)
      days’ notice to exercise the Warrant prior to any Change of Control of the
      Company. This Warrant shall automatically expire and be of no further force
      and
      effect without any action by the Holder immediately prior to the effective
      date
      of a Change of Control. 

    

    5. Adjustment Provisions.
      The
      number and character of shares of Warrant Stock issuable upon exercise of this
      Warrant (or any shares of stock or other securities or property at the time
      receivable or issuable upon exercise of this Warrant) and the Warrant Price
      therefor, are subject to adjustment upon the occurrence of the following events
      between the date this Warrant is issued and the date it is
      exercised:

    

    5.1 Adjustment for Stock Splits, Stock Dividends,
      Recapitalizations, etc.
      The
      Warrant Price of this Warrant and the number of shares of Warrant Stock issuable
      upon exercise of this Warrant (or any shares of stock or other securities at
      the
      time issuable upon exercise of this Warrant) shall each be proportionally
      adjusted to reflect any stock dividend, stock split, reverse stock split,
      combination of shares, reclassification, recapitalization or other similar
      event
      affecting the number of outstanding shares of Warrant Stock (or such other
      stock
      or securities).

    

    5.2 Adjustment for Other Dividends and Distributions.
      In case
      the Company shall make or issue, or shall fix a record date for the
      determination of eligible holders entitled to receive, a dividend or other
      distribution payable respect to the Warrant Stock that is payable in (a)
      securities of the Company (other than issuances with respect to which adjustment
      is made under Section 5.1), or (b) assets (other than cash dividends paid or
      payable solely out of retained earnings), then, and in each such case, the
      Holder, upon exercise of this Warrant at any time after the consummation,
      effective date or record date of such event, shall receive, in addition to
      the
      shares of Warrant Stock issuable upon such exercise prior to such date, the
      securities or such other assets of the Company to which the Holder would have
      been entitled upon such date if the Holder had exercised this Warrant
      immediately prior thereto (all subject to further adjustment as provided in
      this
      Warrant).

    

    5.3 Adjustment for Reorganization, Consolidation,
      Merger, Reverse Merger.
      Except
      as provided in Section 4 (Early Expiration), in case of any reorganization
      of
      the Company (or of any other corporation, the stock or other securities of
      which
      are at the time receivable on the exercise of this Warrant), after the date
      of
      this Warrant, or in case, after such date, the Company (or any such corporation)
      shall consolidate with or merge into another corporation or convey all or
      substantially all of its assets to another corporation, or engage in a reverse
      merger in which the Company is the surviving entity, then, and in each such
      case, the Holder, upon the exercise of this Warrant (as provided in Section
      2),
      at any time after the consummation of such reorganization, consolidation,
      merger, conveyance or reverse merger, shall be entitled to receive, in lieu
      of
      the stock or other securities and property receivable upon the exercise of
      this
      Warrant prior to such consummation, the stock or other securities or property
      to
      which the Holder would have been entitled upon the consummation of such
      reorganization, consolidation, merger, conveyance or reverse merger, if the
      Holder had exercised this Warrant immediately prior thereto, all subject to
      further adjustment as provided in this Warrant, and the Successor or purchasing
      corporation in such reorganization, consolidation, merger, conveyance or reverse
      merger (if other than the Company) shall duly execute and deliver to the Holder
      a supplement hereto acknowledging such corporation's obligations under this
      Warrant; and in each such case, the terms of this Warrant shall be applicable
      to
      the shares of stock or other securities or property receivable upon the exercise
      of this Warrant after the consummation of such reorganization, consolidation,
      merger, conveyance or reverse merger.

     

    
      
        
        

      

      
        -4-

        
          

        

      

      
        
        

      

    

     

    5.4 Conversion of Stock.
      In case
      all the authorized Warrant Stock of the Company is converted, pursuant to the
      Company's Certificate of
      Incorporation, into other securities or property, or the Warrant Stock otherwise
      ceases to exist, then, in such case, the Holder, upon exercise of this Warrant
      at any time after the date on which the Warrant Stock is so converted or ceases
      to exist (the "Termination Date"),
      shall
      receive, in lieu of the number of shares of Warrant Stock that would have been
      issuable upon such exercise immediately prior to the Termination Date (the
      "Former
      Number of Shares of Warrant Stock"),
      the
      stock and other securities and property to which the Holder would have been
      entitled to receive upon the Termination Date if the Holder had exercised this
      Warrant with respect to the Former Number of Shares of Warrant Stock immediately
      prior to the Termination Date (all subject to further adjustment as provided
      in
      this Warrant).

    

    5.5 Notice
      of Adjustments.
      The
      Company shall promptly give written notice of each adjustment or readjustment
      of
      the Warrant Price or the number of shares of Warrant Stock or other securities
      issuable upon exercise of this Warrant. The notice shall describe the adjustment
      or readjustment and show in reasonable detail the facts on which the adjustment
      or readjustment is based.

    

    5.6 No
      Change Necessary.
      The
      form of this Warrant need not be changed because of any adjustment in the
      Warrant Price or in the number of shares of Warrant Stock issuable upon its
      exercise.

    

    5.7 Reservation
      of Stock.
      If at
      any time the number of shares of Warrant Stock or other securities issuable
      upon
      exercise of this Warrant shall not be sufficient to effect the exercise of
      this
      Warrant, the Company will take such corporate action as may, in the opinion
      of
      its counsel, be necessary to increase its authorized but unissued shares of
      Warrant Stock or other securities issuable upon exercise of this Warrant as
      shall be sufficient for such purpose.

    

    6. Adjustment
      of Warrant Price.
      In
      the
      event the Company or its Successor, at any time, from time to time, after the
      date hereof and prior to (i) the payment in full of the Note issued concurrently
      with this Warrant to the Holder or (ii) within twelve months following the
      effective date of the Holder’s election to convert such Note into shares of
      Common Stock in accordance with its terms, as applicable, shall issue and sell
      shares of its equity securities, in one or a series of transactions, to
      investors for aggregate proceeds to the Company of not less than One Million
      Dollars ($1,000,000) at a price less than $3.75 per share, as adjusted for
      stock
      splits and stock dividends (an “Equity
      Financing”),
      the
      Warrant Price shall be adjusted at the closing of the Equity Financing to be
      equal to the lowest price per share received by the Company in the Equity
      Financing; provided, however, that in no event shall the Warrant Price be less
      than $0.90 per share as adjusted. 

     

    
      
        
        

      

      
        -5-

        
          

        

      

      
        
        

      

    

     

    7.
       Extension
      of Expiration Date.
      In
      the
      event that the Holder exercises its Extension Option or the Company prepays
      the
      Notes prior to July 31, 2006 in accordance with the terms and conditions of
      the
      Note, the Expiration Date of the Warrant shall be extended to 5:00 p.m. Pacific
      time on August 1, 2015, without further action on the part of the parties
      hereto. 

    

    8. No Rights or Liabilities as Stockholder.
      This
      Warrant does not by itself entitle the Holder to any voting rights or other
      rights as a stockholder of the Company. In the absence of affirmative action
      by
      the Holder to purchase Warrant Stock by exercise of this Warrant, no provisions
      of this Warrant, and no enumeration herein of the rights or privileges of the
      Holder, shall cause the Holder to be a stockholder of the Company for any
      purpose.

    

    9. No
      Impairment.
      The
      Company will not, by amendment of its Certificate of
      Incorporation or Bylaws, or through reorganization, consolidation, merger,
      dissolution, issue or sale of securities, sale of assets or any other voluntary
      action, willfully avoid or seek to avoid the observance or performance of any
      of
      the terms of this Warrant. Without limiting the generality of the foregoing,
      the
      Company will take all such action as may be necessary or appropriate in order
      that the Company may duly and validly issue fully paid and nonassessable shares
      of Warrant Stock upon the exercise of this Warrant.

    

    9. Attorneys'
      Fees.
      In
      the
      event any party is required to engage the services of any attorneys for the
      purpose of enforcing this Warrant, or any provision thereof, the prevailing
      party shall be entitled to recover its reasonable expenses and costs in
      enforcing this Warrant, including attorneys' fees.

    

    10. Transfer.
      Neither
      this Warrant nor any rights hereunder may be assigned, conveyed or transferred,
      in whole or in part, without the Company's prior written consent, which the
      Company may withhold in its sole discretion; provided, however, that this
      Warrant may be assigned, conveyed or transferred without the prior written
      consent of the Company to any person that directly, or indirectly through one
      or
      more intermediaries, controls, is controlled by, or is under common control
      with
      the Holder. The rights and obligations of the Company and the Holder under
      this
      Warrant and the Purchase Agreement shall be binding upon and benefit their
      respective permitted successors, assigns, heirs, administrators and transferees,
      including any Successor of the Company.

     

    11. Governing Law.
      This
      Warrant shall be governed by and construed under the internal laws of the State
      of California as applied to agreements among California residents entered into
      and to be performed entirely within California, without reference to principles
      of conflict of laws or choice of laws.

     

    12. Headings.
      The
      headings and captions used in this Warrant are used for convenience only and
      are
      not to be considered in construing or interpreting this Warrant. All references
      in this Warrant to sections and exhibits shall, unless otherwise provided,
      refer
      to sections hereof and exhibits attached hereto, all of which exhibits are
      incorporated herein by this reference.

    

    13. Notices.
      All
      notices required or permitted hereunder shall be in writing and shall be deemed
      effectively given: (i) upon personal delivery to the party to be notified,
      (ii) when sent by confirmed telex or facsimile if sent during normal
      business hours of the recipient, if not, then on the next business day;
      (iii) five (5) days after having been sent by registered or certified mail,
      return receipt requested, postage prepaid; or (iv) one day after deposit
      with a nationally recognized overnight courier, specifying next day delivery,
      with written verification of receipt. All communications shall be sent to the
      address of the Holder at the last address furnished to the Company by the Holder
      in writing or, in the case of the Company, at the principal offices of the
      Company, or at such other address as any party or the Company may designate
      by
      giving five (5) days' advance written notice to all other parties.

     

    
      
        
        

      

      
        -6-

        
          

        

      

      
        
        

      

    

     

    14. Amendment; Waiver.
      Any term
      of this Warrant may be amended, and the observance of any term of this Warrant
      may be waived (either generally or in a particular instance and either
      retroactively or prospectively) only with the written consent of the Company
      and
      the Holder. Any amendment or waiver effected in accordance with this Section
      shall be binding upon Holder, each future holder of such securities, and the
      Company.

    

    15. Severability.
      If one
      or more provisions of this Warrant are held to be unenforceable under applicable
      law, such provision(s) shall be excluded from this Warrant and the balance
      of
      the Warrant shall be interpreted as if such provision(s) were so excluded and
      shall be enforceable in accordance with its terms.

    

    16. Compliance
      with Securities Laws.
      This
      Warrant and all shares of Warrant Shares or Common Stock issued upon exercise
      hereof or conversion thereof shall be stamped or imprinted with a legend
      substantially in the following form (in addition to any legend required by
      state
      securities laws or by any investors’ rights agreement or similar
      agreement):

     

    NEITHER
      THIS WARRANT NOR THE SECURITIES ISSUABLE UPON EXERCISE OF THIS WARRANT HAS
      BEEN
      REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (“ACT”), OR ANY
      APPLICABLE STATE SECURITIES LAWS, AND MAY NOT BE OFFERED, SOLD OR OTHERWISE
      TRANSFERRED, PLEDGED OR HYPOTHECATED UNLESS AND UNTIL SUCH SECURITIES ARE
      REGISTERED UNDER SUCH ACT AND APPLICABLE STATE SECURITIES LAWS OR AN OPINION
      OF
      COUNSEL SATISFACTORY TO THE COMPANY IS OBTAINED TO THE EFFECT THAT SUCH
      REGISTRATION IS NOT REQUIRED, OTHER THAN TO ANY OTHER PERSON OR ENTITY WHICH,
      DIRECTLY OR INDIRECTLY, CONTROLS, IS CONTROLLED BY OR IS UNDER COMMON CONTROL
      WITH, OR TO ANY PERSON OR ENTITY THAT IS A PARTNER OR MEMBER OF, THE HOLDER
      HEREOF.

     

    17. Terms Binding.
      By
      acceptance of this Warrant, the Holder accepts and agrees to be bound by all
      the
      terms and conditions of this Warrant.

    

    18. Counterparts.
      This
      Warrant may be executed in two or more counterparts, all of which shall be
      considered one and the same agreement and shall become effective when
      counterparts have been signed by each party and delivered to the other party,
      it
      being understood that both parties need not sign the same counterpart.

    

    
      
        
        

      

      
        -7-

        
          

        

      

      
        
        

      

    

     

    Dated:
      August ___, 2005

    

     

    COMPANY: 

     

    By:
      ___________________________________  

    George
      M.
      Lintz

    Chief
      Financial Officer

    

    

    AGREED
      AND ACKNOWLEDGED:

    

    HOLDER:

     

    By:
      ___________________________________     

    

    [SIGNATURE
      PAGE TO WARRANT]

     

    
      
        
        

      

      
        
        

        
          

        

      

      
        
        

      

    

     

    Exhibit
      1

    

    FORM OF SUBSCRIPTION

    (To
      be
      signed only upon exercise of Warrant)

    

    To:
      Quintessence
      Photonics Corporation

    

    (1) The
      undersigned Holder hereby elects to purchase     
        
      shares
      of stock of Quintessence Photonics Corporation (the
      "Warrant
      Stock"),
      pursuant to the terms of the attached Warrant, and tenders herewith payment
      of
      the purchase price for such shares in full.

    

    (1) Net
      Exercise Election.
      The
      undersigned Holder elects to convert the Warrant into shares of Warrant Stock
      by
      net exercise election pursuant to Section 2.6 of the Warrant. This conversion
      is
      exercised with respect to __________ shares of stock of Quintessence Photonics
      Corporation (the "Warrant
      Stock")
      covered by the Warrant.

    

    [STRIKE
      PARAGRAPH ABOVE THAT DOES NOT APPLY]

    

    (2) In
      exercising the Warrant, the undersigned Holder hereby confirms and acknowledges
      that the representations and warranties set forth in Section 3 of the Purchase
      Agreement (as defined in the Warrant) as they apply to the undersigned Holder
      continue to be true and correct as of this date.

    

    (3) Please
      issue a certificate or certificates representing such shares of Warrant Stock
      in
      the name or names specified below:

     

    
      	 	 	 
	(Name)	 	(Name)
	 	 	 
	 	 	 
	(Address)	 	(Address)
	 	 	 
	  	 	  
	(City, State, Zip Code)	 	(City, State, Zip Code)
	 	 	 
	 	 	 
	(Social Security Number)	 	(Social Security Number)
	 	 	 
	 	 	 
	(Date)	 	(Signature
              of Holder)THE
        SECURITIES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE SECURITIES
        ACT
        OF 1933, AS AMENDED (“ACT”), AND MAY NOT BE SOLD, TRANSFERRED, ASSIGNED,
        PLEDGED, OR HYPOTHECATED ABSENT AN EFFECTIVE REGISTRATION THEREOF UNDER SUCH
        ACT
        OR COMPLIANCE WITH RULE 144 PROMULGATED UNDER SUCH ACT, OR UNLESS THE COMPANY
        HAS RECEIVED AN OPINION OF COUNSEL, SATISFACTORY TO THE COMPANY AND ITS COUNSEL,
        THAT SUCH REGISTRATION IS NOT REQUIRED.

      

      AMENDED
        AND RESTATED

      WARRANT
        TO PURCHASE COMMON STOCK

      OF

      QUINTESSENCE
        PHOTONICS CORPORATION

       

      
        	No. 16	
                Void
                  after May 24,
                  2010

              

      

       

      This
        certifies that for good and valuable consideration previously provided to
        Quintessence Photonics Corporation, a Delaware corporation (the “Company”),
        with
        principal offices currently at 15632 Roxford Street, Sylmar, California 91342,
        receipt of which is hereby acknowledged, Jeffrey Feld is entitled, subject
        to
        the terms and conditions of this Warrant, to purchase from the Company at
        any
        time prior to 5:00 p.m. Pacific time on May 24, 2010 (the “Expiration
        Date”),
        up to
        that number of shares of Warrant Stock (as defined below) as may be purchased
        for the Maximum Purchase Amount (as defined below) at a price per share equal
        to
        the Warrant Price (as defined below), upon surrender of this Warrant at the
        principal offices of the Company, together with a duly executed subscription
        form in the form attached hereto as Exhibit 1
        and
        simultaneous payment of the full Warrant Price for the shares of Warrant
        Stock
        so purchased in lawful money of the United States. The Warrant Price and
        the
        number and character of shares of Warrant Stock purchasable under this Warrant
        are subject to adjustment as provided herein.

      

      This
        Warrant amends, restates and supersedes that certain Warrant issued to Jeffrey
        Feld dated as of May 24, 2004, and is issued pursuant to that certain Loan
        Agreement, dated as of May 21, 2004 and amended as of the date hereof (the
“Purchase
        Agreement”),
        by
        and among, inter alia, the Company and certain of its Lenders, and is subject
        to
        the provisions thereof.

      

      1. Definitions.
        The
        following definitions shall apply for purposes of this Warrant:

       

      1.1. “Change
        of Control”
means
        the consummation of any transaction or series of related transactions that
        results in the holders of record of the Company’s capital stock immediately
        prior to the transaction or transactions holding less than fifty percent
        (50%)
        of the voting power of the Company immediately after the transaction or
        transactions, including the acquisition of the Company by another entity
        and any
        reorganization, merger, consolidation or share exchange, or which results
        in the
        sale of all or substantially all of the assets of the Company.

       

      1.2. “Common
        Stock” means
        the
        common stock of the Company.

       

      1.3. “Company”
means
        the “Company”
as
        defined above and includes any corporation which shall succeed to or assume
        the
        obligations of the Company under this Warrant.

       

      
        
           

        

        
           

          
            

          

        

        
           

        

      

       

      1.4. “Holder”
means
        any person who shall at the time be the registered holder of this
        Warrant.

       

      1.5. “Initial
        Public Offering”
means
        a
        firm commitment underwritten public offering pursuant to an effective
        registration statement filed under the Securities Act of 1933, as amended,
        covering the offer and sale of the Company’s Common Stock to the public for the
        account of the Company.

       

      1.6. “Note”
means
        the Secured Promissory Note, dated as of May 21, 2004 and amended as of
        even date herewith initially payable to the initial Holder hereof.

       

      1.7. “Warrant”
means
        this Warrant and any warrant(s) delivered in substitution or exchange therefor,
        as provided herein.

       

      1.8. “Warrant
        Price”
means,
        with respect to each share of Warrant Stock, (i) if this Warrant is
        exercised by the Holder and any of the following has occurred within
        sixty (60) days prior to such exercise or a notice of any of the following
        has been delivered within thirty (30) days of such exercise pursuant to
        Section 4 hereof: (A) an acquisition of greater than 50% of the
        capital stock of the Company, by merger or otherwise, in which all stockholders
        of the Company receive cash or securities of another entity in exchange for
        their shares of capital stock of the Company; (B) a sale of all or
        substantially all of the assets of the Company; or (C) the effectiveness of
        the Initial Public Offering (any such transaction described in clauses (A),
        (B)
        and (C) above being referred to herein as a “Liquidity
        Event”),
        50%
        of the per share price for Common Stock in such transaction (which shall
        be the
        implied per share price in the case of clause (B) above), (ii) if this
        Warrant is exercised by the Holder and no Liquidity Event has occurred within
        sixty (60) days prior to such exercise and no notice of any of the events
        described in the preceding clauses (i)(A)-(C) has been delivered within
        thirty (30) days of such exercise pursuant to Section 4 hereof, the
        last price per share received by the Company in an equity financing, regardless
        of the class of stock issued and sold; provided, however, that notwithstanding
        the foregoing clauses (i) and (ii), in no event shall the Warrant Price exceed
        $3.75 per share or be less than $1.00 per share. The Warrant Price is subject
        to
        adjustment as provided herein. 

       

      1.9. “Warrant Stock”
means
        the Company’s Common Stock. The number and character of shares of Warrant Stock
        are subject to adjustment as provided herein and the term “Warrant
        Stock”
shall
        include stock and other securities and property at any time receivable or
        issuable upon exercise of this Warrant in accordance with its
        terms.

       

      2. Exercise.

       

      2.1. Method
        of Exercise.
        Subject
        to the terms and conditions of this Warrant, the Holder may exercise this
        Warrant in whole or in part, at any time or from time to time, before the
        Expiration Date, for up to 500,000 shares of Warrant Stock (the “Maximum
        Purchase Amount”),
        by
        surrendering this Warrant at the principal offices of the Company, with the
        subscription form attached hereto duly executed by the Holder, and payment
        of an
        amount equal to the product obtained by multiplying (i) the number of shares
        of
        Warrant Stock to be purchased by the Holder by (ii) the Warrant Price or
        adjusted Warrant Price therefor, if applicable, as determined in accordance
        with
        the terms hereof.

       

      
        
           

        

        
          -2-

          
            

          

        

        
           

        

      

       

      2.2. Form
        of Payment.
        Payment
        may be made by (i) a check payable to the Company’s order, (ii) wire transfer of
        funds to the Company, (iii) cancellation of indebtedness of the Company to
        the
        Holder, or (iv) any combination of the foregoing.

       

      2.3. Partial
        Exercise.
        The
        Warrant shall be exercisable, at the election of the holder thereof, either
        in
        full or from time to time in part and, in the event that the Warrant is
        exercised in respect of fewer than all of the Warrant Stock issuable on such
        exercise at any time prior to the date of expiration of the Warrant, the
        Company
        shall, at the time of delivery of such certificate, deliver to such holder
        a new
        Warrant to purchase the remaining Warrant Stock, which new Warrant shall
        in all
        other respects be identical with the Warrant exercised, or, at the request
        of
        such holder, appropriate notation may be made on the Warrant exercised and
        such
        Warrant shall be returned to such Holder.

       

      2.4. No
        Fractional Shares.
        No
        fractional shares may be issued upon any exercise of this Warrant, and any
        fractions shall be rounded down to the nearest whole number of shares. If
        upon
        any exercise of this Warrant a fraction of a share results, the Company will
        pay
        the cash value of any such fractional share, calculated on the basis of the
        Warrant Price.

       

      2.5. Restrictions
        on Exercise.
        This
        Warrant may not be exercised if the issuance of the Warrant Stock upon such
        exercise would constitute a violation of any applicable federal or state
        securities laws or other laws or regulations. As a condition to the exercise
        of
        this Warrant, the Holder shall execute the subscription form attached hereto,
        confirming and acknowledging that the representations and warranties of the
        Holder set forth in Section 3 of the Purchase Agreement are true and
        correct as of this date of exercise.

       

      2.6. Net
        Exercise Election.
        The
        Holder may elect to convert all or a portion of this Warrant, without the
        payment by the Holder of any additional consideration, by the surrender of
        this
        Warrant or such portion to the Company, with the net exercise election selected
        in the subscription form attached hereto duly executed by the Holder, into
        up to
        the number of shares of Warrant Stock that is obtained under the following
        formula:

       

      X
        =
Y
        (A-B)

           
        A

      

      
        	
                where

              	
                X
                  =

              	
                the
                  number of shares of Warrant Stock to be issued to the Holder pursuant
                  to
                  this Section 2.6.

              

      

      

      
        	 	
                Y
                  =

              	
                the
                  Maximum Purchase Amount divided by the Warrant
                  Price.

              

      

      

      
        	 	
                A
                  =

              	
                the
                  fair market value of one share of Warrant Stock, as determined
                  in good
                  faith by the Company’s Board of Directors, as at the time the net exercise
                  election is made pursuant to this Section
                  2.6.

              

      

      

      
        	 	
                B
                  =

              	
                the
                  Warrant Price.

              

      

      

      The
        Company will promptly respond in writing to an inquiry by the Holder as to
        the
        then current fair market value of one share of Warrant Stock.

       

      
        
           

        

        
          -3-

          
            

          

        

        
           

        

      

       

      3. Issuance
        of Stock.
        This
        Warrant shall be deemed to have been exercised immediately prior to the close
        of
        business on the date of its surrender for exercise as provided above, and
        the
        person entitled to receive the shares of Warrant Stock issuable upon such
        exercise shall be treated for all purposes as the holder of record of such
        shares as of the close of business on such date. As soon as practicable on
        or
        after such date, the Company shall issue and deliver to the person or persons
        entitled to receive the same a certificate or certificates for the number
        of
        whole shares of Warrant Stock issuable upon such exercise.

       

      4. Early
        Expiration.
        If
        the
        Company proposes at any time to effect a Change of Control, the Company shall
        mail to the Holder a notice specifying the date on which the Change of Control
        is anticipated to become effective. The Company shall give Holder thirty
        (30)
        days’ notice to exercise the Warrant prior to any Change of Control of the
        Company. This Warrant shall automatically expire and be of no further force
        and
        effect without any action by the Holder immediately prior to the effective
        date
        of a Change of Control. 

       

      5. Adjustment Provisions.
        The
        number and character of shares of Warrant Stock issuable upon exercise of
        this
        Warrant (or any shares of stock or other securities or property at the time
        receivable or issuable upon exercise of this Warrant) and the Warrant Price
        therefor, are subject to adjustment upon the occurrence of the following
        events
        between the date this Warrant is issued and the date it is
        exercised:

       

      5.1. Adjustment for Stock Splits, Stock Dividends,
        Recapitalizations, etc.
        The
        Warrant Price of this Warrant and the number of shares of Warrant Stock issuable
        upon exercise of this Warrant (or any shares of stock or other securities
        at the
        time issuable upon exercise of this Warrant) shall each be proportionally
        adjusted to reflect any stock dividend, stock split, reverse stock split,
        combination of shares, reclassification, recapitalization or other similar
        event
        affecting the number of outstanding shares of Warrant Stock (or such other
        stock
        or securities).

       

      5.2. Adjustment for Other Dividends and Distributions.
        In case
        the Company shall make or issue, or shall fix a record date for the
        determination of eligible holders entitled to receive, a dividend or other
        distribution payable respect to the Warrant Stock that is payable in (a)
        securities of the Company (other than issuances with respect to which adjustment
        is made under Section 5.1), or (b) assets (other than cash dividends paid
        or
        payable solely out of retained earnings), then, and in each such case, the
        Holder, upon exercise of this Warrant at any time after the consummation,
        effective date or record date of such event, shall receive, in addition to
        the
        shares of Warrant Stock issuable upon such exercise prior to such date, the
        securities or such other assets of the Company to which the Holder would
        have
        been entitled upon such date if the Holder had exercised this Warrant
        immediately prior thereto (all subject to further adjustment as provided
        in this
        Warrant).

       

      5.3. Adjustment for Reorganization, Consolidation,
        Merger.
        Except
        as provided in Section 4 (Early Expiration), in case of any reorganization
        of
        the Company (or of any other corporation, the stock or other securities of
        which
        are at the time receivable on the exercise of this Warrant), after the date
        of
        this Warrant, or in case, after such date, the Company (or any such corporation)
        shall consolidate with or merge into another corporation or convey all or
        substantially all of its assets to another corporation, then, and in each
        such
        case, the Holder, upon the exercise of this Warrant (as provided in Section
        2),
        at any time after the consummation of such reorganization, consolidation,
        merger
        or conveyance, shall be entitled to receive, in lieu of the stock or other
        securities and property receivable upon the exercise of this Warrant prior
        to
        such consummation, the stock or other securities or property to which the
        Holder
        would have been entitled upon the consummation of such reorganization,
        consolidation, merger or conveyance if the Holder had exercised this Warrant
        immediately prior thereto, all subject to further adjustment as provided
        in this
        Warrant, and the successor or purchasing corporation in such reorganization,
        consolidation, merger or conveyance (if other than the Company) shall duly
        execute and deliver to the Holder a supplement hereto acknowledging such
        corporation’s obligations under this Warrant; and in each such case, the terms
        of this Warrant shall be applicable to the shares of stock or other securities
        or property receivable upon the exercise of this Warrant after the consummation
        of such reorganization, consolidation, merger or conveyance.

       

      
        
           

        

        
          -4-

          
            

          

        

        
           

        

      

       

      5.4. Conversion of Stock.
        In case
        all the authorized Warrant Stock of the Company is converted, pursuant to
        the
        Company’s Certificate of
        Incorporation, into other securities or property, or the Warrant Stock otherwise
        ceases to exist, then, in such case, the Holder, upon exercise of this Warrant
        at any time after the date on which the Warrant Stock is so converted or
        ceases
        to exist (the “Termination Date”),
        shall
        receive, in lieu of the number of shares of Warrant Stock that would have
        been
        issuable upon such exercise immediately prior to the Termination Date (the
        “Former
        Number of Shares of Warrant Stock”),
        the
        stock and other securities and property to which the Holder would have been
        entitled to receive upon the Termination Date if the Holder had exercised
        this
        Warrant with respect to the Former Number of Shares of Warrant Stock immediately
        prior to the Termination Date (all subject to further adjustment as provided
        in
        this Warrant).

       

      5.5. Notice
        of Adjustments.
        The
        Company shall promptly give written notice of each adjustment or readjustment
        of
        the Warrant Price or the number of shares of Warrant Stock or other securities
        issuable upon exercise of this Warrant. The notice shall describe the adjustment
        or readjustment and show in reasonable detail the facts on which the adjustment
        or readjustment is based.

       

      5.6. No
        Change Necessary.
        The
        form of this Warrant need not be changed because of any adjustment in the
        Warrant Price or in the number of shares of Warrant Stock issuable upon its
        exercise.

       

      5.7. Reservation
        of Stock.
        If at
        any time the number of shares of Warrant Stock or other securities issuable
        upon
        exercise of this Warrant shall not be sufficient to effect the exercise of
        this
        Warrant, the Company will take such corporate action as may, in the opinion
        of
        its counsel, be necessary to increase its authorized but unissued shares
        of
        Warrant Stock or other securities issuable upon exercise of this Warrant
        as
        shall be sufficient for such purpose.

       

      6. No Rights or Liabilities as Stockholder.
        This
        Warrant does not by itself entitle the Holder to any voting rights or other
        rights as a stockholder of the Company. In the absence of affirmative action
        by
        the Holder to purchase Warrant Stock by exercise of this Warrant, no provisions
        of this Warrant, and no enumeration herein of the rights or privileges of
        the
        Holder, shall cause the Holder to be a stockholder of the Company for any
        purpose.

       

      7. No
        Impairment.
        The
        Company will not, by amendment of its Certificate of
        Incorporation or Bylaws, or through reorganization, consolidation, merger,
        dissolution, issue or sale of securities, sale of assets or any other voluntary
        action, willfully avoid or seek to avoid the observance or performance of
        any of
        the terms of this Warrant. Without limiting the generality of the foregoing,
        the
        Company will take all such action as may be necessary or appropriate in order
        that the Company may duly and validly issue fully paid and nonassessable
        shares
        of Warrant Stock upon the exercise of this Warrant.

       

      
        
           

        

        
          -5-

          
            

          

        

        
           

        

      

       

      8. Attorneys’
        Fees.
        In
        the
        event any party is required to engage the services of any attorneys for the
        purpose of enforcing this Warrant, or any provision thereof, the prevailing
        party shall be entitled to recover its reasonable expenses and costs in
        enforcing this Warrant, including attorneys’ fees.

       

      9. Transfer.
        Neither
        this Warrant nor any rights hereunder may be assigned, conveyed or transferred,
        in whole or in part, without the Company’s prior written consent, which the
        Company may withhold in its sole discretion; provided, however, that this
        Warrant may be assigned, conveyed or transferred without the prior written
        consent of the Company to any person that directly, or indirectly through
        one or
        more intermediaries, controls, is controlled by, or is under common control
        with
        the Holder or to spouse, sibling, descendent or ancestor of Holder. The rights
        and obligations of the Company and the Holder under this Warrant and the
        Purchase Agreement shall be binding upon and benefit their respective permitted
        successors, assigns, heirs, administrators and transferees.

       

      10. Governing Law.
        This
        Warrant shall be governed by and construed under the internal laws of the
        State
        of California as applied to agreements among California residents entered
        into
        and to be performed entirely within California, without reference to principles
        of conflict of laws or choice of laws.

       

      11. Headings.
        The
        headings and captions used in this Warrant are used for convenience only
        and are
        not to be considered in construing or interpreting this Warrant. All references
        in this Warrant to sections and exhibits shall, unless otherwise provided,
        refer
        to sections hereof and exhibits attached hereto, all of which exhibits are
        incorporated herein by this reference.

       

      12. Notices.
        All
        notices required or permitted hereunder shall be in writing and shall be
        deemed
        effectively given: (i) upon personal delivery to the party to be notified,
        (ii) when sent by confirmed telex or facsimile if sent during normal
        business hours of the recipient, if not, then on the next business day;
        (iii) five (5) days after having been sent by registered or certified mail,
        return receipt requested, postage prepaid; or (iv) one day after deposit
        with a nationally recognized overnight courier, specifying next day delivery,
        with written verification of receipt. All communications shall be sent to
        the
        address of the Holder at the last address furnished to the Company by the
        Holder
        in writing or, in the case of the Company, at the principal offices of the
        Company, or at such other address as any party or the Company may designate
        by
        giving five (5) days’ advance written notice to all other parties.

       

      13. Amendment; Waiver.
        Any term
        of this Warrant may be amended, and the observance of any term of this Warrant
        may be waived (either generally or in a particular instance and either
        retroactively or prospectively) only with the written consent of the Company
        and
        the Holder. Any amendment or waiver effected in accordance with this Section
        shall be binding upon Holder, each future holder of such securities, and
        the
        Company.

       

      14. Severability.
        If one
        or more provisions of this Warrant are held to be unenforceable under applicable
        law, such provision(s) shall be excluded from this Warrant and the balance
        of
        the Warrant shall be interpreted as if such provision(s) were so excluded
        and
        shall be enforceable in accordance with its terms.

       

      
        
           

        

        
          -6-

          
            

          

        

        
           

        

      

       

      15. Compliance
        with Securities Laws.
        This
        Warrant and all shares of Warrant Shares or Common Stock issued upon exercise
        hereof or conversion thereof shall be stamped or imprinted with a legend
        substantially in the following form (in addition to any legend required by
        state
        securities laws or by any investors’ rights agreement or similar
        agreement):

       

      NEITHER
        THIS WARRANT NOR THE SECURITIES ISSUABLE UPON EXERCISE OF THIS WARRANT HAS
        BEEN
        REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (“ACT”), OR ANY
        APPLICABLE STATE SECURITIES LAWS, AND MAY NOT BE OFFERED, SOLD OR OTHERWISE
        TRANSFERRED, PLEDGED OR HYPOTHECATED UNLESS AND UNTIL SUCH SECURITIES ARE
        REGISTERED UNDER SUCH ACT AND APPLICABLE STATE SECURITIES LAWS OR AN OPINION
        OF
        COUNSEL SATISFACTORY TO THE COMPANY IS OBTAINED TO THE EFFECT THAT SUCH
        REGISTRATION IS NOT REQUIRED, OTHER THAN TO ANY OTHER PERSON OR ENTITY WHICH,
        DIRECTLY OR INDIRECTLY, CONTROLS, IS CONTROLLED BY OR IS UNDER COMMON CONTROL
        WITH, OR TO ANY PERSON OR ENTITY THAT IS A PARTNER OR MEMBER OF, THE HOLDER
        HEREOF.

       

      16. Terms Binding.
        By
        acceptance of this Warrant, the Holder accepts and agrees to be bound by
        all the
        terms and conditions of this Warrant. 

       

      17. Counterparts.
        This
        Warrant may be executed in two or more counterparts, all of which shall be
        considered one and the same agreement and shall become effective when
        counterparts have been signed by each party and delivered to the other party,
        it
        being understood that both parties need not sign the same counterpart.

       

      
        
           

        

        
          -7-

          
            

          

        

        
           

        

      

       

      Dated:
        March 25, 2005

      

       

      COMPANY: 

       

      By:
        _______________________________

       

      Name:
        ____________________________

       

      Title:
        _____________________________

       

      

      AGREED
        AND ACKNOWLEDGED:

       

       

      HOLDER:

       

      
        By:
          _______________________________

         

        Name:
          ____________________________

         

        Title:
          _____________________________

      

      

      [SIGNATURE
        PAGE TO WARRANT]

      

      
        
           

        

        
           

          
            

          

        

        
           

        

      

       

      Exhibit
        1

      

      FORM OF SUBSCRIPTION

      (To
        be
        signed only upon exercise of Warrant)

      

      To:
        Quintessence
        Photonics Corporation

      

      (1) The
        undersigned Holder hereby elects to purchase     
          
        shares
        of stock of Quintessence Photonics Corporation (the
        “Warrant
        Stock”),
        pursuant to the terms of the attached Warrant, and tenders herewith payment
        of
        the purchase price for such shares in full.

      

      (1) Net
        Exercise Election.
        The
        undersigned Holder elects to convert the Warrant into shares of Warrant Stock
        by
        net exercise election pursuant to Section 2.6 of the Warrant. This conversion
        is
        exercised with respect to __________ shares of stock of Quintessence Photonics
        Corporation (the “Warrant
        Stock”)
        covered by the Warrant.

      

      [STRIKE
        PARAGRAPH ABOVE THAT DOES NOT APPLY]

      

      (2) In
        exercising the Warrant, the undersigned Holder hereby confirms and acknowledges
        that the representations and warranties set forth in Section 3 of the Purchase
        Agreement (as defined in the Warrant) as they apply to the undersigned Holder
        continue to be true and correct as of this date.

      

      (3) Please
        issue a certificate or certificates representing such shares of Warrant Stock
        in
        the name or names specified below:

    

    
       

      
        	 	 	 
	(Name)	 	(Name)
	 	 	 
	 	 	 
	(Address)	 	(Address)
	 	 	 
	  	 	  
	(City, State, Zip Code)	 	(City, State, Zip Code)
	 	 	 
	 	 	 
	(Federal Tax Identification Number)	 	(Federal Tax Identification
                Number)
	 	 	 
	 	 	 
	(Date)	 	(Signature
                of Holder)

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