Document:

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                                                                   Exhibit 10.17
                                    AGREEMENT

                  THIS AGREEMENT made this 16th day of April, 2001, by and
between MACKEN ASSOCIATES, a California Limited Partnership, (hereinafter
referred to as "Lessor") and DEPOSITION SCIENCES, INC., an Ohio Corporation
qualified to do business in the State of California, (hereinafter referred to as
"Lessee").
                                    RECITALS
                           The parties hereto previously entered into an
         Agreement dated March 2, 2001, (the "Lease") whereby Lessee would lease
         certain real property owned by Lessor commonly known as 3300 Coffey
         Lane, Santa Rosa, California, (the "Property") upon the satisfaction of
         certain conditions precedent, all of which were required to occur no
         later than March 16, 2001. All conditions were not satisfied on March
         16, 2001, and the Lease, by its terms, automatically terminated.
          The parties by this Agreement wish to provide for reinstatement of the
         Lease subject to certain modifications to the Lease as expressly stated
         herein and subject to the modifications to confirm and ratify all of
         the terms, covenants, and conditions of the Lease.

                                    AGREEMENT
                  NOW, THEREFORE, IT IS MUTUALLY AGREED AS FOLLOWS:

                  1. Section 1.1 of the Lease is hereby amended to read in its
entirety as follows:

         "1.1      This Agreement and this Amendment thereto shall become
                   effective when

                  (i) signed by all parties hereto upon the date of the party
         last signing,

                  (ii) upon receipt by the Lessee of executed Nondisturbance and

         Attornment Agreements as set forth in Paragraph 13.14 of this Lease
         [Lessor has deposited with the Escrow Holder hereinafter named the
         Nondisturbance and Attornment Agreements from Wells Fargo Bank and John
         Macken and provided copies to Lessee. Lessor has furnished Lessee
         copies of correspondence from Bay Area Development Corp., the holder of
         a second deed of trust against the Property

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         which Lessee has accepted as satisfying the requirements that Lessor
         executed Non-Disturbance and Attornment Agreement from said Bay Area
         Development Corporation],

                  (iii) upon confirmation of the lease guaranty contained in the
         Lease and execution of the lease guarantee provided with this amendment
         by Advanced Lighting Technologies, Inc. (hereinafter "ADLT"),

                  (iv) upon the submission into escrow of the Option Fee as
         provided for in the Option Agreement between the parties dated March 2,
         2001,

                   (v) John Macken and his affiliates shall have acquired 100%
         of the partnership interests of Lessor and all required consents to
         such acquisition have been obtained [Lessor has provided Lessee with
         documentation reflecting that John Macken now owns 80% of the
         partnership interests in Lessor. The documentation reflecting that
         Donald P. Macken has agreed to transfer the remaining 20% of the
         partnership interest to John Macken's nominees upon Donald P. Macken
         acquiring the remaining 20% interest from Ralph Skidmore, and the
         documentation reflecting that Donald P. Macken has entered into an
         agreement with Ralph Skidmore to acquire the remaining 20% interest
         subject to the approve of the U.S. Bankruptcy Court has been provided
         to Lessee],

                  (vi) John Macken shall have filed a notice of recission with
         respect to the notice of default recorded August 7, 2000, as instrument
         00-078996 regarding deeds of trusts filed as instrument numbers 1997
         0115820 and 1999 139354, Official Records of Sonoma County, California
         [Notices of Rescission of Notice of Default has been deposited with the
         Escrow Holder and a copy provided to Lessee],

                  (vii) Lessee shall have received satisfactory estoppel
         certificates from the holders of all deeds of trust filed against the
         Property, including among other things, a representation concerning the
         outstanding balance, default rate and existing defaults [Lessor has
         deposited an executed landlord waiver with Escrow Holder and provided a
         copy to Lessee. An estoppel certificate from Wells Fargo

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         Bank and John Macken has been deposited into escrow and copies
         furnished to Lessee. Lessor has furnished Lessee copies of
         correspondence from Bay Area Development Corp., the holder of a second
         deed of trust against the Property which Lessee has accepted as
         satisfying the requirements that Lessor provide an estoppel certificate
         from said Bay Area Development Corporation]; and

                  (viii) Lessee, at its expenses, shall have obtained a CLTA
         standard leasehold and option policy of title insurance subject only to
         (a) a lien to secure payment of real estate taxes and assessments, not
         delinquent; (b) the lien of supplemental taxes, not delinquent; (c)
         exceptions 4, 5, 6, 7, and 8 as set forth on Exhibit "C " hereto and
         (d) the standard printed exceptions with endorsement to delete the
         exclusions with respect to bankruptcy and creditor rights laws set
         forth as Item 6 in the Exclusions From Coverage. [Lessee has received a
         commitment from the Escrow Holder on behalf of Security Union Title
         Insurance Company to provide the foregoing policy of title insurance
         for the leasehold].

                  (ix) Lessee has received an acceptable legal opinion from Tom
         Kelley opining to the enforceability of the Lease and Option.

                  2. Sonoma Title Guarantee Co., 490 Mendocino Avenue, Santa
Rosa, California, 95401, is hereby designated by the parties as the Escrow
Holder and is hereinafter referred to as "Escrow Holder"). The duties of the
Escrow Holder shall be the same as set forth in the Escrow Agreement entered
into on March 2, 2001, by the parties hereto and Sonoma Title Guarantee Co.

                  3. The Lease, as modified herein, shall be effective
("Effective Date") as of the date all of the conditions provided for in Section
1.1 of the Lease are satisfied but in no event later than June 30, 2001.
Foregoing notwithstanding, Lessee may commence occupation of the Property on the
date hereof and Lessee's obligation to commence paying rent as provided in
Section 3.1 of the Lease shall commence on the date hereof but shall not be due
and payable until the date the U.S. Bankruptcy Court for the Northern District
of California approval of the sale and transfer of Ralph Skidmore's limited
partnership twenty percent (20%) interest in Lessor to Donald P. Macken.

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                  4. Except as herein otherwise expressly provided in this
modification, the parties hereby affirm and ratify all of the terms and
conditions of the Lease which shall commence as of the Effective Date as set
forth above.
                  IN WITNESS WHEREOF the parties hereto have executed this
Agreement as of the day and year first hereinabove written.

                                          MACKEN ASSOCIATES,
                                          A California Limited Partnership

                                          By /s/ John Macken
                                             -----------------------------------
                                                   General Partner

                                          DEPOSITION SCIENCES, INC.

                                          By /s/ Lee Bartolomei
                                            ------------------------------------

         The undersigned hereby agrees to guarantee the obligations of the
lessee hereunder.

                                  GUARANTOR:

                                  ADVANCED LIGHTING TECHNOLOGIES, INC.
                                  an Ohio Corporation

                                  By: /s/ Wayne R. Hellman CEO
                                     -------------------------------------------
                                                                      (Title)

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                                                                   Exhibit 10.18

                            SECOND AMENDMENT TO LEASE

                  THIS AMENDMENT made this 20th day of June, 2001, by and
between MACKEN ASSOCIATES, a California Limited Partnership, (hereinafter
referred to as "Lessor") and DEPOSITION SCIENCES, INC., an Ohio Corporation
qualified to do business in the State of California, (hereinafter referred to as
"Lessee")

                                    RECITALS

                           The parties hereto previously entered into an
                  Agreement dated March 2, 2001, (the "Lease") whereby Lessee
                  would lease certain real property owned by Lessor commonly
                  known as 3300 Coffey Lane, Santa Rosa, California, (the
                  "Property") which Lease was modified by a First Amendment
                  dated April 16, 2001. The parties now wish to enter into a
                  Second Amendment to the Lease and subject to the modifications
                  herein contained confirm and ratify all of the terms,
                  covenants and conditions of the Lease as previously amended.

                                    AGREEMENT

                  NOW, THEREFORE, IT IS MUTUALLY AGREED AS FOLLOWS:

                  1.       Section 3.5 is hereby added to the Lease providing
in full as follows:

                  3.5       PAYMENT OF RENT. Lessee shall pay the rent as
required by this Article 3 to an account maintained by Washington Mutual Bank,
FA (hereinafter referred to as the "Lender") from which Lender shall withdraw
the monthly payment due to Lender from Lessor pursuant to Lessor's promissory
note payable to Lender, the payment of which is secured by a deed of trust,
security agreement, assignment of leases and rent and fixture filing (
hereinafter collectively the "Deed of Trust") which creates a first lien on the
Premises. Lessor shall be permitted by Lender to withdraw the balance of the
rent paid each month from said account.

                  2.         Section 10.1 is hereby modified to read in its
entirety as follows:

                  10.1 LESSEE'S DUTY TO RESTORE PREMISES. If at any time during
the term of this Lease the Premises are totally or partially damaged or
destroyed, Lessee shall, in the shortest time practicable and no later than six
(6) months after receiving the necessary governmental building approvals (which
approvals must be received within six (6) months of the damage or destruction of
the Premises), restore the Premises to substantially the same condition as they
were in

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immediately before such damage or destruction; provided however, that unless (i)
such damage or destruction is due to the fault of Lessee Lessee's financial
obligation shall be limited to the amount of insurance coverage required by
Article 9 of this Lease, (ii) Lessee's shall have no obligation to undertake
physical restoration of the Premises unless more than two (2) years remains n
the lease term, and (iii) Lessee shall have no obligation to undertake physical
restoration of the Premises if the holder of any mortgage or deed of trust on
the Premises exercises its right to apply to the funds received from Lessee's
insurer to satisfy the obligations secured by the mortgage or deed of trust. If
required by this Section, Lessee will do all acts reasonably necessary to
promptly obtain the necessary governmental building approvals and Lessor shall
diligently cooperate with Lessee to obtain these approvals. Lessor shall approve
all changes in the condition of the Premises occasioned by the restoration work.
Lessee's obligation to restore the Premises shall not be affected by Lessee's
failure to obtain or maintain the insurance Lessee is required to carry under
this Lease. If Lessee fails to restore the Premises as herein required, Lessor
may restore the Premises. Lessor shall not be required to restore the Lessee any
of his alterations, improvements, trade fixtures or personal property, such
excluded items being the sole responsibility of Lessee to restore, except to the
extent that such alterations, improvements, trade fixtures or personal property
can be restored with insurance proceeds.

                  3.       Section 11.1 is hereby modified in its entirety to
         read as follows:

                  11.1     LESSEE'S DEFAULT.   The occurrence of any one or more
of the following events shall constitute a default and breach of this Lease by
Lessee.

         (a)      The failure by Lessee to make any rental payment or any other
                  payment required to be made by Lessee hereunder, as and when
                  due, where such failure shall continue for a period of thirty
                  (30) days after written notice thereof by Lessor to Lessee.

         (b)      The failure by Lessee to observe or perform any of the
                  covenants, conditions or provisions of this Lease, other than
                  those described in Section 11.1(a) herein where such failure
                  shall continue for a period of thirty (30) days after written
                  notice thereof by Lessor to Lessee; provided, however, if the
                  nature of Lessee's default is a non-monetary default that
                  reasonably requires that more than thirty (30) days for its
                  cure, then Lessee shall not be deemed to be in default if
                  Lessee commences such cure within said thirty (30) day period
                  and thereafter diligently pursues such cure to a prompt
                  completion. If Lessee does not pursue such a cure to a prompt
                  completion, then Lessor shall have the right to terminate this
                  Lease.

         (c)      The making by Lessee of any general assignment or general
                  arrangement for the benefit of creditors; or the filing by or
                  against Lessee of a petition to have Lessee adjudged a
                  bankrupt, or a petition for reorganization or arrangement
                  under any law relating to bankruptcy (unless, in the case of a
                  petition filed against Lessee, the same is dismissed within
                  sixty (60) days); or the appointment of a trustee or a
                  receiver to take possession of all or substantially all of
                  Lessee's assets located at

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                  the Premises or of Lessee's interest in this Lease, where such
                  seizure is not discharged within thirty (30) days.

         (d)      If Lessee permits, commits, suffers, or maintains any unlawful
                  act, nuisance or waste on or about the Premises, which
                  materially damages the Premises.

                  4.       Section 11.2(f)  is hereby added  to read as follows:

         (f)      Notwithstanding anything to the contrary contained in this
                  Article 11, Lessor shall not have the right to exercise its
                  remedies as provided in this Lease, as amended, if Lessee
                  either (i) cures the default prior to the effective date of
                  the termination of the Lease (provided that Lessee shall not
                  be entitled to so reinstate the Lease following failure to
                  timely cure a default and receipt of notice of termination of
                  the Lease more than once during any five year period) or (ii)
                  contests the existence of the default prior to the effective
                  date of the termination of the Lease in a court of competent
                  jurisdiction and complies with the final, non-appealable
                  order.

                  5.       Except as herein otherwise expressly stated and
provided in this modification, the parties hereby affirm and ratify all of the
terms and conditions of the Lease and the First Amendment to the Lease.

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

                                  MACKEN ASSOCIATES,
                                  A California limited Partnership

                                  By /s/ John Macken
                                    -------------------------------------------
                                                    General Partner
                                  DEPOSITION SCIENCES, INC.

                                  By /S/ BERNT HOPPERT
                                    -------------------------------------------

                  The undersigned hereby agrees to guarantee the obligations of
the Lessee hereunder.

                                  ADVANCED LIGHTING AND TECHNOLOGIES
                                  An Ohio Corporation

                                  By /s/ Steven C. Potts, Treasurer
                                    -------------------------------------------
                                                                     (Title)

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