Document:

<PAGE>

                                                                    Exhibit 10.4

                    FOURTH AMENDMENT TO AMENDED AND RESTATED
                              FORBEARANCE AGREEMENT

         THIS FOURTH AMENDMENT TO AMENDED AND RESTATED FORBEARANCE AGREEMENT
(this "Amendment") is made and entered into as of this 30th day of January,
2003, among Advanced Lighting Technologies, Inc., Venture Lighting Power
Systems, North America Inc., Parry Power Systems Limited, and Venture Lighting
Europe Ltd. (collectively, "Borrowers"), PNC Bank, National Association, as
Agent ("Agent") and PNC Bank, National Association, National City Commercial
Finance, Inc. and Sovereign Bank (collectively, "Lenders"). Capitalized terms
used herein without definition have the meanings ascribed thereto in the Amended
and Restated Forbearance Agreement among the parties hereto dated October 18,
2002 (the "Forbearance Agreement").

                                    RECITALS

         A. Borrowers, Agent and Lenders entered into the Forbearance Agreement
on October 18, 2002, which Forbearance Agreement was amended by the Amendment to
Forbearance Agreement among Borrowers, Agent and Lenders dated November 19, 2002
(the "First Amendment"), the Second Amendment to Forbearance Agreement among
Borrowers, Agent and Lenders dated January 15, 2003 (the "Second Amendment"),
and the Third Amendment to Forbearance Agreement among Borrowers, Agent and
Lenders dated January 23, 2003 (the "Third Amendment") (the First Amendment,
Second Amendment, and Third Amendment together with the Forbearance Agreement,
the "Amended Forbearance Agreement").

         B. The Amended Forbearance Agreement provided for a Forbearance Period
expiring January 30, 2003, provided that the conditions to forbearance set forth
in Section 2 thereof were satisfied.

         C. Borrowers now request that Agent and Lenders again agree to continue
to make Revolving Loans and to forbear for an additional period of time from
exercising their rights and remedies under the Credit Agreement, the Security
Documents and other Related Writings.

         D. Agent and Lenders are willing to enter into this Amendment and to
agree to provide an additional Forbearance Period to Borrowers, on the terms and
subject to the conditions set forth in this Amendment.

<PAGE>

                                    AGREEMENT

         In consideration of the Recitals and of the mutual promises and
covenants contained herein, Lenders and Borrowers agree as follows:

         1. FORBEARANCE PERIOD. Section 1(a) of the Amended Forbearance
Agreement is hereby amended to delete the date "January 30, 2003" and insert in
lieu thereof "February 3, 2003."

         2. NO COURSE OF DEALING; NO COMMITMENT TO FURTHER FORBEAR.

                  (a) Except as provided in this Amendment, Agent and Lenders
         expressly reserve all rights and remedies they may have against
         Borrowers, and any and all additional borrowers, guarantors, debtors
         and/or obligors for the Loans. Borrowers specifically acknowledge and
         agree that neither Agent nor any Lender has made any promise,
         commitment or representation whatsoever, nor has Agent or any Lender
         any obligation to Borrowers to modify the terms of the Amended
         Forbearance Agreement, Credit Agreement, any Security Document or other
         Relating Writing or the Loans, offer any discounted payoff of the
         Loans, refinance the Loans, grant any forbearance (other than as
         provided in the Amended Forbearance Agreement), extend the payment
         terms of the Loans or extend any other financial accommodation to
         Borrowers.

                  (b) Without limiting any provision of Section 2(a) above or
         otherwise in this Agreement, and notwithstanding Agent and Lenders
         deeming an Engagement Letter acceptable to them, nothing contained in
         this Agreement or otherwise requires Agent or Lenders: to further
         extend the Forbearance Period; enter into a new forbearance agreement;
         if a new forbearance agreement were to be entered into, to agree to
         include certain terms in such a forbearance agreement; to continue to
         make available to Borrowers Revolving Loans under the Credit Agreement
         beyond the Forbearance Period; or to forbear from exercising rights as
         to the Collateral beyond the Forbearance Period.

         3. INTEGRATION. Except as set forth in Section 1 hereof, the Amended
Forbearance Agreement remains in full force and effect and is integrated in its
entirety into this Amendment. References in the Amended Forbearance Agreement to
"this Agreement" are hereby deemed to include this Amendment.

         4. COUNTERPARTS; TELECOPIED SIGNATURES. This Amendment may be executed
in any number of counterparts and by different parties to this Amendment on
separate counterparts, each of which, when so executed, shall be deemed an
original, but all such counterparts shall constitute one and the same agreement.
Any signature delivered by a party by facsimile transmission shall be deemed to
be an original signature hereto.

         5. RELEASE OF CLAIMS AND WAIVER. Borrowers and U.S. Guarantors hereby
release, remise, acquit and forever discharge Agent and Lender and Agent's and
Lenders' employees, agents, representatives, consultants, attorneys,
fiduciaries, servants, officers, directors, partners, predecessors, successors
and assigns, subsidiary corporations, parent corporations, and related corporate
divisions (all of the foregoing hereinafter called the "Released Parties"), from
any and all actions and causes of action, judgments, executions, suits, debts,
claims, demands, liabilities,

                                     Page 2
<PAGE>

obligations, damages and expenses of any and every character, known or unknown,
direct and/or indirect, at law or in equity, of whatsoever kind or nature,
whether heretofore or hereafter arising, for or because of any matter or things
done, omitted or suffered to be done by any of the Released Parties prior to and
including the date of execution hereof, and in any way directly or indirectly
arising out of or in any way connected to this Amendment, the Amended
Forbearance Agreement, the Credit Agreement, the Security Documents and other
Related Writings (all of the foregoing hereinafter called the "Released
Matters"). Borrowers and U.S. Guarantors acknowledge that the agreements in this
paragraph are intended to be in full satisfaction of all or any alleged injuries
or damages arising in connection with the Released Matters. Each of the
Borrowers and U.S. Guarantors represent and warrant to Lenders and Agent that it
has not purported to transfer, assign or otherwise convey any right, title or
interest of Borrowers or U.S. Guarantors in any Released Matter to any other
Person and that the foregoing constitutes a full and complete release of all
Released Matters.

         6. LEGAL REPRESENTATION OF PARTIES. This Amendment was negotiated and
agreed to by the parties with the benefit of legal representation and any rule
of construction or interpretation otherwise requiring this Amendment or any
other Loan Document to be construed or interpreted against any party shall not
apply to any construction or interpretation hereof or thereof.

         7. GOVERNING LAW. This Amendment is governed by the laws of the State
of Ohio.

                [REMAINDER OF THIS PAGE INTENTIONALLY LEFT BLANK]

                                     Page 3
<PAGE>

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

                                         U.S. BORROWER:

Address:  32000 Aurora Road              ADVANCED LIGHTING
          Solon, Ohio 44139                 TECHNOLOGIES, INC.
          Attention:  Treasurer

                                         By: /s/ Steven C. Potts
                                            -----------------------------
                                         Title: Chief Financial Officer
                                               --------------------------

                                         CANADIAN BORROWER:

Address:  10 Chandler Road               VENTURE LIGHTING POWER
          P.O. Box 250                      SYSTEMS, NORTH AMERICA INC.
          Amherst, Nova Scotia BH4 3Z2
          Attention:  Treasurer
                                         By: /s/ R. Douglas Oulton
                                            -----------------------------
                                         Title: VP - Finance and Administration
                                               --------------------------------

                                         UK BORROWERS:

Address:  Victoria Mills                 PARRY POWER SYSTEMS LIMITED
          Draycott
          Derby DE72 3PW England
          Attention:  Treasurer          By: /s/ E. Young
                                            -----------------------------
                                         Title: Director
                                               --------------------------

Address:  Victoria Mills                 VENTURE LIGHTING EUROPE LTD.
          Draycott
          Derby DE72 3PW England
          Attention:  Treasurer          By: /s/ E. Young
                                            -----------------------------
                                         Title: Director
                                               --------------------------

                                     Page 4

<PAGE>
                                           AGENT AND THE BANKS:

Address:  PNC Bank, National Association   PNC BANK, NATIONAL ASSOCIATION,
          1 PNC Plaza                        as Agent and as a Bank
          249 Fifth Avenue
          Pittsburgh, PA 15222
          Attention:  Richard Muse, Jr.    By: /s/ Richard F. Muse, Jr.
                                              -----------------------------
                                           Title: Vice President
                                                 --------------------------

Address:  Sovereign Bank                   SOVEREIGN BANK
          Routes 3 & 320-Aldwyn Two
          Villanova, PA  19087
          Mailcode 20-536-ARO
          Attention:  Richard Geld         By: /s/ Richard M. Geld
                                              -----------------------------
                                           Title: Vice President
                                                 --------------------------

Address:  National City Commercial         NATIONAL CITY COMMERCIAL
            Finance, Inc.                    FINANCE, INC.
          1965 East 6th Street
          Cleveland, Ohio 44114
          Attention:  Dennis Hatvany       By: /s/ Dennis Hatvany
                                              -----------------------------
                                           Title: Vice President
                                                 --------------------------

                                     Page 5

<PAGE>

                              CONSENT OF GUARANTOR

         The undersigned are the U.S. Guarantors referred to in the Credit
Agreement. The undersigned do hereby consent to the terms of this Amendment and
do hereby ratify and confirm the Guaranty of Payment in all respects. The
undersigned further specifically consent to and join in the agreements, waivers
and releases contained this Amendment.

                                        ADLT Realty Corp. I, Inc.
                                        ADLT Services, Inc.
                                        APL Engineered Materials, Inc.
                                        Ballastronix (Delaware), Inc.
                                        Lighting Resources International, Inc.
                                        Microsun Technologies, Inc.
                                        Venture Lighting International, Inc.

                                        By: /s/ Steven C. Potts
                                           ---------------------------------
                                        Name: Steven C. Potts
                                             -------------------------------
                                        Title: Chief Financial Officer
                                              ------------------------------
                                        of each of the companies listed above

                                        Deposition Sciences, Inc.

                                        By: /s/ Steven C. Potts
                                           ---------------------------------
                                        Name: Steven C. Potts
                                             -------------------------------
                                        Title: Chief Financial Officer
                                              ------------------------------
                                        signing for each of the companies listed
                                        above by Power of Attorney

                                     Page 6<PAGE>
                                                                    Exhibit 10.5

                     FIFTH AMENDMENT TO AMENDED AND RESTATED
                              FORBEARANCE AGREEMENT

         THIS FIFTH AMENDMENT TO AMENDED AND RESTATED FORBEARANCE AGREEMENT
(this "Amendment") is made and entered into as of this 3rd day of February,
2003, among Advanced Lighting Technologies, Inc., Venture Lighting Power
Systems, North America Inc., Parry Power Systems Limited, and Venture Lighting
Europe Ltd. (collectively, "Borrowers"), PNC Bank, National Association, as
Agent ("Agent") and PNC Bank, National Association, National City Commercial
Finance, Inc. and Sovereign Bank (collectively, "Lenders"). Capitalized terms
used herein without definition have the meanings ascribed thereto in the Amended
and Restated Forbearance Agreement among the parties hereto dated October 18,
2002 (the "Forbearance Agreement").

                                    RECITALS

         A. Borrowers, Agent and Lenders entered into the Forbearance Agreement
on October 18, 2002, which Forbearance Agreement was amended by the Amendment to
Forbearance Agreement among Borrowers, Agent and Lenders dated November 19, 2002
(the "First Amendment"), the Second Amendment to Forbearance Agreement among
Borrowers, Agent and Lenders dated January 15, 2003 (the "Second Amendment"),
the Third Amendment to Forbearance Agreement among Borrowers, Agent and Lenders
dated January 23, 2003 (the "Third Amendment"), and the Fourth Amendment to
Forbearance Agreement among Borrowers, Agent and Lenders dated January 30, 2003
(the "Fourth Amendment") (the First Amendment, Second Amendment, Third
Amendment, and Fourth Amendment together with the Forbearance Agreement, the
"Amended Forbearance Agreement").

         B. The Amended Forbearance Agreement provided for a Forbearance Period
expiring February 3, 2003, provided that the conditions to forbearance set forth
in Section 2 thereof were satisfied.

         C. Borrowers now request that Agent and Lenders again agree to continue
to make Revolving Loans and to forbear for an additional period of time from
exercising their rights and remedies under the Credit Agreement, the Security
Documents and other Related Writings.

         D. Agent and Lenders are willing to enter into this Amendment and to
agree to provide an additional Forbearance Period to Borrowers, on the terms and
subject to the conditions set forth in this Amendment.

<PAGE>

                                    AGREEMENT

         In consideration of the Recitals and of the mutual promises and
covenants contained herein, Lenders and Borrowers agree as follows:

         1. FORBEARANCE PERIOD. Section 1(a) of the Amended Forbearance
Agreement is hereby amended to delete the date "February 3, 2003" and insert in
lieu thereof "February 5, 2003."

         2. NO COURSE OF DEALING; NO COMMITMENT TO FURTHER FORBEAR.

            (a) Except as provided in this Amendment, Agent and Lenders
     expressly reserve all rights and remedies they may have against Borrowers,
     and any and all additional borrowers, guarantors, debtors and/or obligors
     for the Loans. Borrowers specifically acknowledge and agree that neither
     Agent nor any Lender has made any promise, commitment or representation
     whatsoever, nor has Agent or any Lender any obligation to Borrowers to
     modify the terms of the Amended Forbearance Agreement, Credit Agreement,
     any Security Document or other Relating Writing or the Loans, offer any
     discounted payoff of the Loans, refinance the Loans, grant any forbearance
     (other than as provided in the Amended Forbearance Agreement), extend the
     payment terms of the Loans or extend any other financial accommodation to
     Borrowers.

            (b) Without limiting any provision of Section 2(a) above or
     otherwise in this Agreement, and notwithstanding Agent and Lenders deeming
     an Engagement Letter acceptable to them, nothing contained in this
     Agreement or otherwise requires Agent or Lenders: to further extend the
     Forbearance Period; enter into a new forbearance agreement; if a new
     forbearance agreement were to be entered into, to agree to include certain
     terms in such a forbearance agreement; to continue to make available to
     Borrowers Revolving Loans under the Credit Agreement beyond the Forbearance
     Period; or to forbear from exercising rights as to the Collateral beyond
     the Forbearance Period.

         3. INTEGRATION. Except as set forth in Section 1 hereof, the Amended
Forbearance Agreement remains in full force and effect and is integrated in its
entirety into this Amendment. References in the Amended Forbearance Agreement to
"this Agreement" are hereby deemed to include this Amendment.

         4. COUNTERPARTS; TELECOPIED SIGNATURES. This Amendment may be executed
in any number of counterparts and by different parties to this Amendment on
separate counterparts, each of which, when so executed, shall be deemed an
original, but all such counterparts shall constitute one and the same agreement.
Any signature delivered by a party by facsimile transmission shall be deemed to
be an original signature hereto.

         5. RELEASE OF CLAIMS AND WAIVER. Borrowers and U.S. Guarantors hereby
release, remise, acquit and forever discharge Agent and Lender and Agent's and
Lenders' employees, agents, representatives, consultants, attorneys,
fiduciaries, servants, officers, directors, partners, predecessors, successors
and assigns, subsidiary corporations, parent corporations, and related corporate
divisions (all of the foregoing hereinafter called the "Released Parties"), from
any and all actions and causes of action, judgments, executions, suits, debts,
claims, demands, liabilities,

                                       2

<PAGE>

obligations, damages and expenses of any and every character, known or unknown,
direct and/or indirect, at law or in equity, of whatsoever kind or nature,
whether heretofore or hereafter arising, for or because of any matter or things
done, omitted or suffered to be done by any of the Released Parties prior to and
including the date of execution hereof, and in any way directly or indirectly
arising out of or in any way connected to this Amendment, the Amended
Forbearance Agreement, the Credit Agreement, the Security Documents and other
Related Writings (all of the foregoing hereinafter called the "Released
Matters"). Borrowers and U.S. Guarantors acknowledge that the agreements in this
paragraph are intended to be in full satisfaction of all or any alleged injuries
or damages arising in connection with the Released Matters. Each of the
Borrowers and U.S. Guarantors represent and warrant to Lenders and Agent that it
has not purported to transfer, assign or otherwise convey any right, title or
interest of Borrowers or U.S. Guarantors in any Released Matter to any other
Person and that the foregoing constitutes a full and complete release of all
Released Matters.

         6. LEGAL REPRESENTATION OF PARTIES. This Amendment was negotiated and
agreed to by the parties with the benefit of legal representation and any rule
of construction or interpretation otherwise requiring this Amendment or any
other Loan Document to be construed or interpreted against any party shall not
apply to any construction or interpretation hereof or thereof.

         7. GOVERNING LAW. This Amendment is governed by the laws of the State
of Ohio.

                [REMAINDER OF THIS PAGE INTENTIONALLY LEFT BLANK]

                                       3

<PAGE>

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

                                          U.S. BORROWER:

Address:  32000 Aurora Road               ADVANCED LIGHTING
          Solon, Ohio 44139                TECHNOLOGIES, INC.
          Attention:  Treasurer

                                          By: /s/ Steven C. Potts
                                             -----------------------------------
                                          Title: Chief Financial Officer
                                                --------------------------------

                                          CANADIAN BORROWER:

Address:  10 Chandler Road                VENTURE LIGHTING POWER
          P.O. Box 250                     SYSTEMS, NORTH AMERICA INC.
          Amherst, Nova Scotia BH4 3Z2
          Attention:  Treasurer
                                          By: /s/ R. Douglas Oulton
                                             -----------------------------------
                                          Title: VP - Finance and Administration
                                                --------------------------------

                                          UK BORROWERS:

Address   Victoria Mills                  PARRY POWER SYSTEMS LIMITED
          Draycott
          Derby DE72 3PW England
          Attention:  Treasurer
                                          By: /s/ E. Young
                                             -----------------------------------
                                          Title: Director
                                                --------------------------------

Address:  Victoria Mills                  VENTURE LIGHTING EUROPE LTD.
          Draycott
          Derby DE72 3PW England
          Attention:  Treasurer
                                          By: /s/ E. Young
                                             -----------------------------------
                                          Title: Director
                                                --------------------------------

                                       4

<PAGE>

                                           AGENT AND THE BANKS:

Address:  PNC Bank, National Association   PNC BANK, NATIONAL ASSOCIATION,
          1 PNC Plaza                       as Agent and as a Bank
          249 Fifth Avenue
          Pittsburgh, PA 15222
          Attention:  Richard Muse, Jr.
                                           By:/s/ Richard F. Muse, Jr.
                                             ----------------------------------
                                           Title: Vice President
                                                -------------------------------

Address:  Sovereign Bank                   SOVEREIGN BANK
          Routes 3 & 320-Aldwyn Two
          Villanova, PA  19087
          Mailcode 20-536-ARO              By: /s/ Richard Geld
          Attention:  Richard Geld            ----------------------------------
                                           Title: Vice President
                                                 -------------------------------

Address:  National City Commercial         NATIONAL CITY COMMERCIAL
            Finance, Inc.                   FINANCE, INC.
          1965 East 6th Street
          Cleveland, Ohio 44114
          Attention:  Dennis Hatvany
                                           By: /s/ Dennis Hatvany
                                              ----------------------------------
                                           Title: Vice President
                                                 -------------------------------
                                       5

<PAGE>

                              CONSENT OF GUARANTOR

         The undersigned are the U.S. Guarantors referred to in the Credit
Agreement. The undersigned do hereby consent to the terms of this Amendment and
do hereby ratify and confirm the Guaranty of Payment in all respects. The
undersigned further specifically consent to and join in the agreements, waivers
and releases contained this Amendment.

                                         ADLT Realty Corp. I, Inc.
                                         ADLT Services, Inc.
                                         APL Engineered Materials, Inc.
                                         Ballastronix (Delaware), Inc.
                                         Lighting Resources International, Inc.
                                         Microsun Technologies, Inc.
                                         Venture Lighting International, Inc.

                                         By: /s/ Steven C. Potts
                                            -----------------------------------
                                         Name: Steven C. Potts
                                              ---------------------------------
                                         Title: Chief Financial Officer
                                              ---------------------------------
                                         of each of the companies listed above

                                         Deposition Sciences, Inc.

                                         By: /s/ Steven C. Potts
                                            -----------------------------------
                                         Name: Steven C. Potts
                                              ---------------------------------
                                         Title: Chief Financial Officer
                                              ---------------------------------
                                         signing for each of the companies
                                         listed above by Power of Attorney

                                      6

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