<PAGE>

                                                                EXHIBIT 10.1.18

                      ADVANCED LIGHTING TECHNOLOGIES, INC.
                            STOCK PURCHASE AGREEMENT

      THIS PURCHASE AGREEMENT ("Purchase Agreement") is dated as of May 25,
2004 between ADVANCED LIGHTING TECHNOLOGIES, INC. (the "Company"), and Robert
Cizik ("Purchaser").

                              W I T N E S S E T H:

      WHEREAS, Purchaser desires to purchase shares of the Company as herein
described, on the terms and conditions set forth in this Purchase Agreement.
Certain capitalized terms used in this Purchase Agreement are defined in ANNEX 1
attached hereto.

      NOW, THEREFORE, it is agreed between the parties as follows:

1.    PURCHASE OF SHARES.

      Pursuant to the terms of this Purchase Agreement, Purchaser hereby agrees
to purchase from the Company and the Company agrees to sell and issue to
Purchaser 11.67 shares of the Company's common stock and 338.33 shares of the
Company's Series A Preferred stock (collectively, the "Stock") for Three Hundred
Fifty Thousand Dollars ($350,000.00) (the "Purchase Price") payable by wire
transfer, cashier's check or money order at the Closing.

2.    CLOSING.

      Payment shall be delivered from Purchaser to the Company at the Closing,
as such term is hereinafter defined. The closing hereunder (the "Closing") shall
occur at the offices of the Company on June 24, 2004, or such other time and
place as may be designated by the Company (the "Closing Date"). At the Closing,
the Company shall deliver to Purchaser:

      (a)   Share certificates for 11.67 shares of the Company's common stock.

      (b)   Share certificates for 338.33 shares of the Company's Series A
            Preferred stock.

      (c)   Any and all other instruments not herein specifically provided for
            but which are reasonably necessary or desirable to effectuate the
            purposes of this Purchase Agreement.

3.    THIRD PARTY TRANSFER RESTRICTIONS.

      3.1   Right of First Refusal. In the event Purchaser proposes to sell,
            pledge or otherwise transfer to a party other than a Permitted
            Transferee, pursuant to a bona fide purchase offer, shares of the
            Stock acquired pursuant to this Purchase Agreement or any interest
            in such Stock at any time prior to an Initial Public Offering, the
            Company shall have the "Right of First Refusal" with respect to all
            (and not less than all) of such shares of the Stock. Purchaser must
            give a written

<PAGE>

            "Transfer Notice" to the Company describing fully the proposed
            transfer, including the number of shares proposed to be transferred,
            the proposed transfer price and the name and address of the proposed
            transferee and including a copy of the bona fide purchase offer. The
            Transfer Notice shall be signed both by Purchaser and by the
            proposed transferee and must constitute a binding commitment of both
            parties to the transfer of the shares. Such Right of First Refusal
            with respect to the Stock shall terminate upon the sale of common
            stock by the Company pursuant to an Initial Public Offering.

            The Company and its assignees shall have the right to purchase all,
            and not less than all, of the shares of the Stock on the terms
            described in the Transfer Notice (subject, however, to any change in
            such terms permitted in the next paragraph) by delivery of a Notice
            of Exercise of the Right of First Refusal within 30 days after the
            date when the Transfer Notice was received by the Company.

            If the Company fails to exercise its Right of First Refusal within
            30 days after the date when it received the Transfer Notice,
            Purchaser may, not later than 60 days following receipt of the
            Transfer Notice by the Company, conclude a transfer of the shares of
            the Stock subject to the Transfer Notice on the terms and conditions
            described in the Transfer Notice. Any proposed transfer on terms and
            conditions different from those described in the Transfer Notice, as
            well as any subsequent proposed transfer by Purchaser, shall again
            be subject to the Right of First Refusal and shall require
            compliance with the procedure described in the paragraph above. If
            the Company exercises its Right of First Refusal, Purchaser and the
            Company (or its assignees) shall consummate the sale of the shares
            of the Stock on the terms set forth in the Transfer Notice;
            provided, however, that the purchase price for such shares shall be
            the lesser of the price described in such Transfer Notice or Fair
            Market Value and, provided further, however, if at the time of the
            exercise of such Right of First Refusal there shall exist any
            Company Payment Condition, the Company may defer the payment for the
            purchase until such time as the Company Payment Condition no longer
            exists.

            The Company's Right of First Refusal shall inure to the benefit of
            its successors and assigns and shall be binding upon any transferee
            of the Shares. The Company's rights under this Subsection shall be
            freely assignable, in whole or in part.

      3.2   Right to Compel Sale. (a) Compelled Sale. If members of the Saratoga
            Group propose a Change of Control Transaction, then Saratoga shall
            have the right (whether the Change of Control results from the sale
            of all, or some lesser portion, of the Saratoga Group's shares of
            the Company's common stock) to require Purchaser (or his Permitted
            Transferee) to sell all, or a Pro Rata Portion, of his shares of the
            Stock to the prospective purchaser of the shares owned by Saratoga
            (if such right is exercised, a "Compelled Sale"). If the prospective
            purchaser in the Change of Control Transaction proposed by the
            Saratoga Group is to acquire shares of the Company's common stock
            (or Series A Preferred stock) owned the

                                      -2-
<PAGE>

            Saratoga Group, but Saratoga does not elect to cause a Compelled
            Sale pursuant to the foregoing sentence, then Purchaser (or such
            Permitted Transferee) shall have the right to elect to sell to the
            prospective purchaser, as part of the Change of Control Transaction,
            the Pro Rata Portion of Purchaser's (or such Permitted Transferee's)
            Stock (if such right is exercised, a "Co-Sale"). The consideration
            to be received by Purchaser (or such Permitted Transferee) for each
            share of Stock in the Compelled Sale or Co-Sale shall be the same
            consideration per share to be received by the Saratoga Group, and
            the terms and conditions of such sale by Purchaser (or such
            Permitted Transferee) shall be the same as those upon which the
            Saratoga Group sell their shares, except that Purchaser (or such
            other party) shall not be bound by the terms of any indemnity,
            hold-back or escrow given to the prospective purchaser in connection
            with such sale to the extent that such indemnity is not limited in
            value with respect to Purchaser (or such Permitted Transferee) to at
            most the aggregate consideration to be received for his shares of
            the Stock in such sale.

            (b) Notice and Sale Procedures. (i) The Company shall provide
            written notice to Purchaser (or his Permitted Transferee) of any
            proposed Change of Control Transaction, which notice (a "Control
            Transaction Notice") shall: (A) set forth the consideration per
            share to be paid by the prospective purchaser and (B) state whether
            Saratoga is electing pursuant to Section 3.2(a) to cause a Compelled
            Sale. If Saratoga does not elect to cause a Compelled Sale and
            Purchaser (or such Permitted Transferee) desires to cause a Co-Sale
            pursuant to Section 3.2(a), Purchaser (or such Permitted Transferee)
            must give written notice of his election to cause such Co-Sale (a
            "Co-Sale Notice") to Saratoga (or the representative of Saratoga as
            may be designated in the Control Transaction Notice) within ten (10)
            days following the date of the Control Transaction Notice. Within
            ten (10) days following the date of the Control Transaction Notice
            in which Saratoga has elected to cause a Compelled Sale, Purchaser
            (or Permitted Transferee) shall deliver to Saratoga (or such
            designated representative), or in the case of a Co-Sale, the Co-Sale
            Notice shall be accompanied by, the certificates representing the
            shares of the Stock held by Purchaser (or Permitted Transferee) to
            be sold in such Compelled Sale or Co-Sale, together with a suitably
            executed blank stock power and all other documents required to be
            executed in connection with such Change of Control Transaction. In
            the event that Purchaser (or Permitted Transferee) should fail to
            deliver such certificates and other documents as aforesaid, the
            Company shall cause the books and records of the Company to show
            that such shares are bound by the provisions of this Section 3.2 and
            that such shares shall be transferred only to the purchaser
            identified in the Change of Control Notice upon surrender for
            transfer by Purchaser (or any other party) thereof.

            (ii) If, within one hundred twenty (120) days after the Saratoga
            Group gives the notice they have not completed the sale of
            Saratoga's shares described in the notice, the Saratoga Group shall
            return to Purchaser (or such Permitted

                                      -3-
<PAGE>

            Transferee) all certificates representing shares that Purchaser (or
            such Permitted Transferee) delivered for sale pursuant hereto,
            together with any such other documents delivered by Purchaser.

            (iii) Promptly after the consummation of the sale of the shares of
            the Saratoga Group and Purchaser (or Permitted Transferee) pursuant
            to this Section, the Saratoga Group shall remit to Purchaser (or
            Permitted Transferee) the total sales price of the shares of the
            Stock of Purchaser (or Permitted Transferee) sold pursuant thereto,
            and shall furnish such other evidence of the completion and time of
            completion of such sale or other disposition and the terms thereof
            as may be reasonably requested by Purchaser (or Permitted
            Transferee).

4.    PURCHASER'S RIGHTS UPON REPURCHASE.

      At such time as the Company makes available, the consideration for the
Stock to be repurchased in accordance with the provisions of Section 3 of this
Purchase Agreement, then from and after such time the person from whom such
shares are to be repurchased shall no longer have any rights as a holder of such
shares (other than the right to receive payment of such consideration in
accordance with this Purchase Agreement). Such shares shall be deemed to have
been repurchased in accordance with the applicable provisions hereof, whether or
not the certificate(s) therefor have been delivered as required by this Purchase
Agreement.

5.    TRANSFER BY PURCHASER TO CERTAIN TRUSTS.

      Purchaser shall have the right to transfer all or any portion of
Purchaser's interest in the shares of Stock issued under this Purchase Agreement
which have been delivered to Purchaser under the provisions of this Purchase
Agreement, to a trust established by Purchaser for the benefit of Purchaser,
Purchaser's spouse or Purchaser's children, without being subject to the
provisions of Section 3 hereof, provided that the trustee on behalf of the trust
shall agree in writing to be bound by the terms and conditions of this Purchase
Agreement. The transferee shall execute a copy of EXHIBIT A attached hereto and
file the same with the Secretary of the Company.

6.    LEGEND ON SHARES.

      All certificates representing the Stock purchased under this Purchase
Agreement shall, where applicable, have endorsed thereon the following legends
and any other legends required by applicable securities laws:

            "THE SECURITIES REPRESENTED BY THIS CERTIFICATE ARE SUBJECT TO
            CERTAIN RESTRICTIONS ON TRANSFER AND REPURCHASE REQUIREMENTS AS SET
            FORTH IN AN AGREEMENT BETWEEN THE COMPANY AND THE REGISTERED HOLDER,
            OR SUCH HOLDER'S PREDECESSOR IN INTEREST. SUCH AGREEMENT IMPOSES
            CERTAIN TRANSFER RESTRICTIONS AND CERTAIN REPURCHASE REQUIREMENTS ON
            THE COMPANY (OR ITS ASSIGNS) UPON THE SALE OF THE SHARES. A COPY OF
            SUCH AGREEMENTS IS ON FILE AT

                                      -4-
<PAGE>

            THE PRINCIPAL OFFICE OF THE COMPANY AND WILL BE FURNISHED UPON
            WRITTEN REQUEST TO THE SECRETARY OF THE COMPANY BY THE HOLDER OF
            SHARES REPRESENTED BY THIS CERTIFICATE.

            THE SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN
            REGISTERED UNDER THE SECURITIES ACT OF 1933, OR THE SECURITIES LAWS
            OF ANY STATE, AND MAY BE OFFERED AND SOLD ONLY IF REGISTERED AND
            QUALIFIED PURSUANT TO THE RELEVANT PROVISIONS OF FEDERAL AND STATE
            SECURITIES LAWS OR IF THE COMPANY IS PROVIDED AN OPINION OF COUNSEL,
            SATISFACTORY TO THE COMPANY AND ITS COUNSEL, THAT REGISTRATION AND
            QUALIFICATION UNDER FEDERAL AND STATE SECURITIES LAWS IS NOT
            REQUIRED."

7.    PURCHASER'S INVESTMENT REPRESENTATIONS.

      This Purchase Agreement is made with Purchaser in reliance upon
Purchaser's representation to the Company, which by Purchaser's acceptance
hereof Purchaser confirms, that the Stock which Purchaser will receive will be
acquired with Purchaser's own funds for investment for an indefinite period for
Purchaser's own account, not as a nominee or agent, and not with a view to the
sale or distribution of any part thereof, and that Purchaser has no present
intention of selling, granting participation in, or otherwise distributing the
same, but subject, nevertheless, to any requirement of law that the disposition
of Purchaser's property shall at all times be within Purchaser's control. By
executing this Purchase Agreement, Purchaser further represents that Purchaser
does not have any contract, understanding or agreement with any person to sell,
transfer, or grant participation, to such person or to any third person, with
respect to any of the Stock.

      Purchaser understands that the Stock will not be registered or qualified
under federal or state securities laws on the ground that the sale provided for
in this Purchase Agreement is exempt from registration or qualification under
federal or state securities laws and that the Company's reliance on such
exemption is predicated on Purchaser's representations set forth herein.

      Purchaser agrees that in no event will Purchaser make a disposition of any
of the Stock (including a disposition under Section 5 of this Purchase
Agreement), unless and until (i) Purchaser shall have notified the Company of
the proposed disposition and shall have furnished the Company with a statement
of the circumstances surrounding the proposed disposition and (ii) Purchaser
shall have furnished the Company with an opinion of counsel satisfactory to the
Company to the effect that (A) such disposition will not require registration or
qualification of such Stock under federal or state securities laws or (B)
appropriate action necessary for compliance with the federal or state securities
laws has been taken or (iii) the Company shall have waived, expressly and in
writing, its rights under clauses (i) and (ii) of this section.

      With respect to a transaction occurring prior to such date as the Stock is
covered by a valid federal registration statement, this subsection shall apply
unless the transaction is covered

                                      -5-
<PAGE>

by Rule 701 under the Securities Act of 1933, as amended (the "Securities Act")
or another exemption. In connection with the investment representations made
herein, Purchaser represents that Purchaser is able to fend for himself or
herself in the transactions contemplated by this Purchase Agreement, has such
knowledge and experience in financial and business matters as to be capable of
evaluating the merits and risks of Purchaser's investment, has the ability to
bear the economic risks of Purchaser's investment and has been furnished with
and has had access to such information as would be made available in the form of
a registration statement together with such additional information as is
necessary to verify the accuracy of the information supplied and to have all
questions answered by the Company.

      Purchaser understands that if a registration statement covering the Stock
(or a filing pursuant to the exemption from registration under Regulation A of
the Securities Act) under the Securities Act is not in effect when Purchaser
desires to sell the Stock, Purchaser may be required to hold the Stock for an
indeterminate period. Purchaser also acknowledges that Purchaser understands
that any sale of the Stock which might be made by Purchaser in reliance upon
Rule 144 under the Securities Act may be made only in limited amounts in
accordance with the terms and conditions of that Rule.

8.    NO DUTY TO TRANSFER IN VIOLATION HEREUNDER.

      The Company shall not be required (a) to transfer on its books any shares
of Stock of the Company which shall have been sold or transferred in violation
of any of the provisions set forth in this Purchase Agreement or (b) to treat as
owner of such shares or to accord the right to vote as such owner or to pay
dividends to any transferee to whom such shares shall have been so transferred.

9.    RIGHTS OF PURCHASER.

      Except as otherwise provided herein, Purchaser shall, during the term of
this Purchase Agreement, exercise all rights and privileges of a stockholder of
the Company with respect to the Stock.

10.   OTHER NECESSARY ACTIONS.

      The parties agree to execute such further instruments and to take such
further action as may reasonably be necessary to carry out the intent of this
Purchase Agreement.

11.   NOTICE.

      Any notice required or permitted hereunder shall be given in writing and
shall be deemed effectively given upon the earliest of personal delivery,
receipt or the third full day following deposit in the United States Post Office
with postage and fees prepaid, addressed to the other party hereto at the
address last known or at such other address as such party may designate by 10
days' advance written notice to the other party hereto.

                                      -6-
<PAGE>

12.   SUCCESSORS AND ASSIGNS.

      This Purchase Agreement shall inure to the benefit of the successors and
assigns of the Company and, subject to the restrictions on transfer herein set
forth, be binding upon Purchaser and Purchaser's heirs, executors,
administrators, successors and assigns. No waiver of any breach or condition of
this Purchase Agreement shall be deemed to be a waiver of any other or
subsequent breach or condition, whether of a like or different nature.

13.   APPLICABLE LAW.

      This Purchase Agreement shall be governed by, and construed in accordance
with, the laws of the State of Ohio, as such laws are applied to contracts
entered into and performed in such state.

14.   NO FEDERAL OR OTHER STATE REGISTRATION.

      THE SALE OF THE SECURITIES WHICH ARE THE SUBJECT OF THIS PURCHASE
AGREEMENT HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933 OR THE
SECURITIES LAW OF ANY STATE AND THE ISSUANCE OF SUCH SECURITIES OR THE PAYMENT
OR RECEIPT OF ANY PART OF THE CONSIDERATION THEREFOR PRIOR TO SUCH REGISTRATION
OR QUALIFICATION IS UNLAWFUL, UNLESS THE SALE OF SECURITIES IS EXEMPT FROM SUCH
REGISTRATION OR QUALIFICATION. THE RIGHTS OF ALL PARTIES TO THIS PURCHASE
AGREEMENT ARE EXPRESSLY CONDITIONED UPON SUCH REGISTRATION OR QUALIFICATION
BEING OBTAINED, UNLESS THE SALE IS SO EXEMPT.

15.   NO ORAL MODIFICATION.

      No modification of this Purchase Agreement shall be valid unless made in
writing and signed by the parties hereto.

16.   ENTIRE AGREEMENT.

      This Purchase Agreement constitutes the entire complete and final
agreement between the parties hereto with regard to the subject matter hereof.

                            [Signature Page Follows]

                                      -7-
<PAGE>

      IN WITNESS WHEREOF, the parties hereto have executed this Purchase
Agreement as of the day and year first above written.

      ADVANCED LIGHTING                      PURCHASER
      TECHNOLOGIES, INC.

      By:   /s/ Wayne Vespoli                By:   /s/ Robert Cizik
            ----------------------------           -----------------------------
      Name: Wayne Vespoli                    Name: Robert Cizik
      Its:  Executive Vice President         Its:
            and Treasurer
                                      -8-
<PAGE>

                                                                         ANNEX 1

                                   DEFINITIONS

Affiliate shall mean, with respect to any person or entity, a person or entity
which controls, is controlled by or is under common control with, such person or
entity.

Board of Directors or Board shall mean the Board of Directors of the Company, as
constituted from time to time.

Change in Control means, (i) (a) such time as a "person" or "group" (within the
meaning of Sections 13(d) and 14(d)(2) of the Exchange Act) becomes the ultimate
"beneficial owner" (as defined in Rule 13d-3 under the Exchange Act) of more
than 50% of the total voting power of the Stock on a fully diluted basis, and
(b) such ownership represents a greater percentage of the total voting power of
the Stock on a fully diluted basis than may be voted by (I) Saratoga and/or any
of its Affiliates, (II) any "group" (within the meaning of Sections 13(d) and
14(d)(2) of the Exchange Act) that includes a member of the Saratoga Group; if
members of the Saratoga Group "beneficially own" (within the meaning of Rule
13d-3 under the Exchange Act) Stock representing the majority of the voting
power of the Stock owned by such group and (III) Executive Managers; provided
however that a Change of Control shall not be deemed to have occurred by reason
of the fact that one or more of the Executive Managers become the beneficial
owners of more than 50% of the total voting power of the Company on a fully
diluted basis; or (ii) individuals who on the effective date of the Purchase
Agreement constitute the members of the Board (together with any new or
successor directors whose election by the Board or whose nomination by the Board
for election by stockholders was approved by a vote of at least two-thirds of
the members of the Board on the date of their election or nomination) cease for
any reason to constitute a majority of the members of the Board then in office.

Change of Control Transaction shall mean a transfer of Shares for value by one
or more members of the Saratoga Group effecting a Change of Control.

Code shall mean the Internal Revenue Code of 1986, as amended.

Committee shall mean a committee of the Board of Directors consisting of all of
the Outside Directors other than Robert Cizik.

Common-Law Employee means an individual paid from W-2 Payroll of the Company or
an Affiliate. If, during any period, the Company (or Affiliate, as applicable)
has not treated an individual as a Common-Law Employee and, for that reason, has
not paid such individual in a manner which results in the issuance of a Form W-2
and withheld taxes with respect to him or her, then that individual shall not be
an eligible Employee for that period, even if any person, court of law or
government agency determines, retroactively, that that individual is or was a
Common-Law Employee during all or any portion of that period.

                                      -9-
<PAGE>

Company Payment Condition shall mean any restrictions on the purchase of Stock
by the Company contained in (i) its principal secured credit facility, (ii) the
indenture relating to its Senior Notes due 2009, and (iii) applicable law.

Exchange Act means the Securities and Exchange Act of 1934, as amended.

Executive Managers means the five individuals who were the most highly
compensated officers or employees of the Company and its Subsidiaries, taken as
a whole, for the most recent fiscal year of the Company.

Fair Market Value means the market price of Shares, determined by the Committee
as follows:

      If the Shares were traded over-the-counter on the date in question but
      were not traded on the NASDAQ Stock Market or the NASDAQ National Market
      System, then the Fair Market Value shall be equal to the mean between the
      last reported representative bid and asked prices quoted for such date by
      the principal automated inter-dealer quotation system on which the Shares
      are quoted or, if the Shares are not quoted on any such system, by the
      "Pink Sheets" published by the National Quotation Bureau, Inc.;

      If the Shares were traded over-the-counter on the date in question and
      were traded on the NASDAQ Stock Market or the NASDAQ National Market
      System, then the Fair Market Value shall be equal to the last-transaction
      price quoted for such date by the NASDAQ Stock Market or the NASDAQ
      National Market;

      If the Shares were traded on a stock exchange on the date in question,
      then the Fair Market Value shall be equal to the closing price reported by
      the applicable composite transactions report for such date; and

      If none of the foregoing provisions is applicable, then the Fair Market
      Value shall be determined by the Committee in good faith on the basis of
      existing facts and circumstances.

      In all cases, the determination of Fair Market Value by the Committee
shall be conclusive and binding on all persons.

Initial Public Offering shall mean an underwritten public offering or offerings
of Stock by the Company pursuant to one or more effective registration
statements under the Securities Act which in the aggregate result in (i)
aggregate net proceeds to the Company of not less than $20,000,000.00 and (ii)
at least 20% of the issued and outstanding Stock of the Company being held by
persons other than any "person" or "group" (within the meaning of Sections 13(d)
and 14(d)(2) of the Exchange Act) which is the ultimate "beneficial power" (as
defined in Rule 13d-3 under the Exchange Act) of more than 5% of the total
voting power of the voting stock of the Company on a fully diluted basis. If an
Initial Public Offering is the result of more than one public offering, the
Initial Public Offering shall be deemed to have occurred upon completion of the
last public offering constituting the Initial Public Offering.

                                      -10-
<PAGE>

Outside Director shall mean a member of the Board who is not a Common-Law
Employee of the Company.

Permitted Transfer shall mean a transfer or assignment of Shares from Purchaser
to a Permitted Transferee.

Permitted Transferee shall mean (a) Purchaser's immediate family members or
linear descendants, (b) a trust for the benefit of Purchaser and/or such family
members or (c) a partnership consisting solely of Purchaser and one or more such
family members; provided however, that such transferee, at the time of such
transfer shall agree in writing to abide by the terms of the transfer
restrictions in any related Purchase Agreement. Shares held by any such
transferee shall be subject to all the conditions and restrictions set forth in
the applicable Purchase Agreement, as if such transferee were a party to such
Agreement.

Purchase Price Per Share shall mean the consideration for which one Share may be
acquired pursuant to the Award.

Pro Rata Portion shall mean, with respect to Purchaser, the percentage of such
Purchaser's Shares which equals the number of Shares transferred by members of
the Saratoga Group in a Change of Control transaction, divided by the number of
Shares held by members of the Saratoga Group prior to such transaction.

Saratoga shall mean Saratoga Lighting Holdings LLC, its successors and assigns.

Saratoga Group shall mean Saratoga and each and every Affiliate of Saratoga.

Securities Act shall mean the Securities Act of 1933, as amended.

Share shall mean one share of Stock.

Stock shall mean the common stock or Series A Preferred Stock of the Company, as
applicable, under this Purchase Agreement.

Subsidiary means any subsidiary corporation within the meaning of Code Section
424(f)) with respect to the Company.

W-2 Payroll means whatever mechanism or procedure that the Company or an
Affiliate of the Company utilizes to pay any individual which results in the
issuance of Form W-2 to the individual. "W-2 Payroll" does not include any
mechanism or procedure which results in the issuance of any form other than a
Form W-2 to an individual, including, but not limited to, any Form 1099 which
may be issued to an independent contractor, an agency employee or a consultant.
Whether a mechanism or procedure qualifies as a "W-2 Payroll" shall be
determined in the absolute discretion of the Company (or Affiliate, as
applicable), and the Company or Affiliate determination shall be conclusive and
binding on all persons.

                                      -11-
<PAGE>

                                    EXHIBIT A

                   Acknowledgment of and Agreement to be Bound
                    By the Common Stock Purchase Agreement of
                      ADVANCED LIGHTING TECHNOLOGIES, INC.

      The undersigned, as transferee of shares of ADVANCED LIGHTING
TECHNOLOGIES, INC., hereby acknowledges that he or she has read and reviewed the
terms of the Stock Purchase Agreement of ADVANCED LIGHTING TECHNOLOGIES, INC.
and hereby agrees to be bound by the terms and conditions thereof, as if the
undersigned had executed said Stock Purchase Agreement as an original party
thereto.

Dated:                        20           By:
        --------------------,   ----             -------------------------------