THIS PROMISSORY NOTE IS SUBJECT TO CERTAIN  RESTRICTIONS ON ITS  TRANSFERABILITY
AS SET FORTH IN PARAGRAPH 7 OF A LOAN AGREEMENT  EXECUTED BY MAKER AND HOLDER AS
OF THE DATE HEREOF.


                                 PROMISSORY NOTE


$300,000.00                                                Hartford, Connecticut
                                                           August 2, 1990

         FOR VALUE  RECEIVED,  AUTOMATED  LIGHT  TECHNOLOGIES,  INC., a Delaware
corporation  having a  principal  office  and place of  business  located at 176
Bolton Road in the Town of Vernon,  County of Tolland and State of  Connecticut,
(the  "Maker"),  promises  to  pay  to  the  order  of  CONNECTICUT  INNOVATIONS
INCORPORATED,  a corporation  constituted a quasi-public  instrumentality of the
State of Connecticut ("Holder"),  at 845 Brook Street in the Town of Rocky Hill,
County of  Hartford  and State of  Connecticut  or at such other place as Holder
hereof may designate in writing, the principal sum of THREE HUNDRED THOUSAND AND
NO/100 DOLLARS ($300,000.00), together with interest thereon in arrears from the
date hereof at the rate of eight and one-half per centum (8.5%) per annum.  Said
principal and interest shall be due and payable as follows, viz:

         Upon the  execution of this Note,  interest from the 2nd day of August,
1990 to and including August 31 ,1990 shall be due and payable; thereafter Maker
shall make  payments  to  interest  in the amount of TWO  THOUSAND  ONE  HUNDRED
TWENTY-FIVE AND NO/100 DOLLARS ($2,125.00) on the first day of October, 1990 and
a like sum on the first day of each month  thereafter to and including  March 1,
1991;  thereafter  Maker shall make  payments to  principal  and interest in the
amount of FIVE THOUSAND SEVEN HUNDRED SIX AND 23/100 DOLLARS  ($5,702.23) on the
first  day of  April,  1991,  and a like sum on the  first day of each and every
month  thereafter  until the entire said principal sum, with interest,  has been
fully paid,  except that if not sooner paid,  the final payment of principal and
interest in the amount of FIVE  THOUSAND  SEVEN  HUNDRED SIX AND 41/100  DOLLARS
($5,706.41)  shall be due and payable on  September  1, 1996.  Each  installment
shall be applied  first to the payment of interest  on the unpaid  principal  of
this Note and the balance on the account of the principal of this Note.

         Maker  agrees to pay all taxes,  other  than  income  taxes,  or duties
levied or assessed upon said sum against Holder or other owner of this Note, the
debt evidenced hereby or the collateral securing the same (the "Collateral") and
to pay all costs, expenses, and attorneys' reasonable fees incurred by Holder in
any proceeding for the collection of the debt evidenced  hereby or in any action
to enforce its rights in premises granted under a



<PAGE>




Security  Agreement  and  Collateral  Assignment  and  Security  Agreement  (the
"Security  Agreements")  upon the  happening of a default as provided for in the
Security  Agreements or in  protecting  or  sustaining  the lien of the Security
Agreements or in any  litigation or  controversy  arising from or connected with
this Note or the Security Agreements.

         There shall be an event of default: (i) if the Maker defaults in making
any payment of  principal  or interest on this Note for fifteen  (15) days or in
making any payment of taxes or any municipal assessment,  any insurance premiums
or any lien or charge  upon any  property  by which  this Note is secured as the
same become due, or (ii) if Maker fails to perform any covenant contained in the
Loan  Agreement or the Security  Agreements or if the Maker  defaults under this
Note, the Loan Agreement or the Security Agreements or any other document signed
by Maker in connection  therewith and the same is not cured within  fifteen (15)
days of its occurrence,  or (iii) if an order for relief is sought by or against
Maker  under  the  Federal   Bankruptcy  Code  or  acts  amendatory  thereof  or
supplemental  thereto or under any other statute  either of the United States or
any  state  in  connection  with  insolvency  or   reorganization  or  upon  the
appointment of a receiver or trustee of all or a portion of Maker's property and
any such order for  relief,  receiver  or trustee is not  withdrawn,  dismissed,
discharged,  or removed  within  sixty (60) days,  or (iv) if an  assignment  of
Maker's property is made for the benefit of creditors,  or (v) if Maker abandons
any  Collateral  securing  this Note not  otherwise  permitted  in the  Security
Agreements,  or (vi) if Maker  declares in writing its inability to pay debts as
they come due, or (vii) if Maker  liquidates  or dissolves or is  liquidated  or
dissolved,  or (viii) if the  Collateral  securing  this Note is  damaged in any
manner and is not covered by insurance  as required by the Security  Agreements,
or (ix) it the United States of America,  the State of Connecticut or any agency
or subdivision  thereof imposes a tax, levy, or assessment on or concerning this
Note,  which Maker is obligated to pay and cannot  lawfully or does not pay when
due, or (x) if title to any position or all of the Collateral securing this Note
becomes  vested in a party other than Maker hereof or is encumbered by financing
without  Holder's prior written consent not otherwise  permitted in the Security
Agreements or (xi) if Maker relocates its principal place of business outside of
the State of  Connecticut,  or (xii) if Maker  relocates its principal  place of
business  within the State of  Connecticut  without first  obtaining the written
consent of Holder.

         Upon the  occurrence of an event of default,  the entire  principal sum
with accrued  interest thereon due under this Note shall at the option of Holder
become due and  payable.  No failure to exercise  such option  shall be deemed a
waiver on the part of Holder of any right accruing thereafter.  In addition,  in
the event Hiker becomes a wholly owned  subsidiary  of another  entity or all or
substantially all of its assets are purchased by


                                      -2-

<PAGE>




another entity or Maker relocates its principal place of business outside of the
State of  Connecticut,  then the  entire  principal  sum with  accrued  interest
thereon  due-under  this  Note  shall at the  option of  Holder  become  due and
payable.

         Holder may  collect a "late  charge"  not to exceed an amount  equal to
five percent (5%) of any  installment  of interest or principal or both which is
not paid  within  ten (10) days of the date on which said  payment i8 due.  Late
charges shall be separately charged to and collected from Maker and shall be due
upon demand by Holder.

         Maker  shall  have the  right to  prepay  this Note in whole or in part
without premium or penalty upon any scheduled payment date.

         Maker of this Note and all others whom may become liable for all or any
part of this  obligation  do  hereby  waive  demand,  presentment  for  payment,
protest,  notice of protest and notice of non-payment of this Note and do hereby
consent to any number of renewals or  extensions  of the time of payment  hereof
and agree that any such renewals or extensions may be made without notice to any
of said parties and without affecting their liability herein and further consent
to the  release  of any  part or parts or all of the  security  for the  payment
hereof and to the  release of any party or parties  liable  hereon,  all without
affecting the liability of the other persons,  firms or corporations  liable for
the payment of this Note.

         Upon the  occurrence  of an event of a  default,  at the  option of the
Holder, the Holder may pay insurance premiums, taxes and assessments and any and
all  other  expenses  which  may be  reasonable  or  necessary  to  protect  the
Collateral  securing this Note or to protect or sustain the lien of the Security
Agreements.  Any such payment made by the Holder hereof  pursuant to said option
shall be added to the  principal  balance due  hereunder and shall bear interest
from the date of payment by Holder or shall be payable on demand  with  interest
from the date of payment by Holder.

         Maker agrees that al 1 expenditures  incurred by Holder under this Note
or the Security Agreements other than principal,  and the principal of this Note
after maturity or  acceleration  or upon an event of default or after a judgment
hereon,  shall bear interest at the rate of twelve  percent (12%) per annum from
the date of demand, acceleration, default or judgment as applicable.

         TO  INDUCE  HOLDER  TO  ENTER  INTO  THE  COMMERCIAL  LOAN  TRANSACTION
EVIDENCED BY THIS NOTE,  THE LOAN  AGREEMENT  AND THE SECURITY  AGREEMENTS,  THE
MAKER HEREOF AGREES THAT THE SAID TRANSACTION IS A COMMERCIAL AND NOT A CONSUMER
TRANSACTION  AND  WAIVES  THE RIGHT TO  NOTICE OF AND A HEARING  ON THE RIGHT OF
HOLDER UNDER CHAPTER 903a OF THE CONNECTICUT  GENERAL  STATUTES OR OTHER STATUTE
OR STATUTES AFFECTING PREJUDGMENT REMEDIES AND


                                      -3-

<PAGE>



AUTHORIZES  HOLDER'S  ATTORNEY TO ISSUE A WRIT FOR  PREJUDGMENT  REMEDY  WITHOUT
COURT ORDER, PROVIDED THE COMPLAINT SHALL SET FORTH A COPY OF THE WAIVER.

         "Holder", as used herein, Shall include any holder or
holders hereof.

         This Note shall be governed by and  construed  in  accordance  with the
laws of the State of Connecticut.

                                            AUTOMATED LIGHT TECHNOLOGIES, INC.


                                            By /s/ MOHD A. ASLAMI
                                              -----------------------
                                              MOHD A. ASLAMI
                                              Its President
                                              Duly Authorized

This Note is secured by a Security  Agreement  and a Collateral  Assignment  and
Security Agreement, each of even date herewith.


                                      -4-