Document:

<PAGE>   1
                                                                   EXHIBIT 10.18

[CHASE LOGO]

                     [CHASE BANK OF TEXAS, N.A. LETTERHEAD]

CRAFTMADE INTERNATIONAL, INC.                                    August 11, 1999
DUROCRAFT INTERNATIONAL, INC.
TRADE SOURCE INTERNATIONAL, INC.
C/D/R INCORPORATED
650 S. Royal Lane, Suite 100
Coppell, Texas 75050

Re: FIFTH AMENDMENT TO CREDIT AGREEMENT; Credit Agreement dated as of May 30,
1996, as amended by First Amendment dated as of October 8, 1996, Second
Amendment dated as of November 1, 1997, Third Amendment dated as of July 1,
1998, and Fourth Amendment dated as of April 2, 1999 (as so amended, the "Credit
Agreement"), among the addressees, Chase Bank of Texas, N.A., Frost National
Bank, and Chase Bank of Texas, N.A., as agent

Dear Sirs or Madams:

     We refer to the Credit Agreement referenced above. All capitalized terms
defined in the Credit Agreement and not otherwise defined in this letter have
the same meanings herein as in the Credit Agreement. This letter is the fifth
amendment of the Credit Agreement.

     This letter evidences the agreement of the parties to the Credit Agreement
to amend the last proviso of Section 8.4 of the Credit Agreement by substituting
`$4,000,000" for "$3,000,000." As such, the last proviso of Section 8.4 as
hereby amended reads in its entirety as follows:

     "provided, however, that Borrower may purchase treasury stock so long as
     (a) the amounts spent for such purchases, in any fiscal year, do not exceed
     $4,000,000 and (b) Borrower remains in compliance with the Consolidated
     Debt to Consolidated Tangible Net Worth Ratio as evidenced by a Treasury
     Stock Purchase Compliance Certificate, substantially in the form of EXHIBIT
     F-1 attached hereto, submitted to the Agent showing the effect of any
     potential treasury stock purchases contemplated by Borrower during a thirty
     (30) day period commencing on the earlier of (i) the date such Treasury
     Stock Purchase Compliance Certificate is sent to the Agent or (ii) the date
     of the initial treasury stock purchase covered by such certificate."

<PAGE>   2

CRAFTMADE INTERNATIONAL, INC. et al
August 11, 1999
Page 2

Borrower hereby represents and warrants to the Agent and the Lenders that as of
the date of this letter, the execution, delivery and performance of this letter
and any and all other Loan Documents executed and delivered in connection with
this letter have been authorized by all requisite corporate action, including
resolutions of the boards of directors, on the part of Borrower and Guarantor;
that no Event of Default has occurred and is continuing and no event or
condition has occurred that with the giving of notice or lapse of time or both
would be an Event of Default; and that each of Borrower and Guarantor is in full
compliance with all covenants and agreements contained in the Credit Agreement,
as amended hereby.

     C/D/R hereby acknowledges, consents and agrees to this letter and (a)
acknowledges that its obligations under that certain Guaranty Agreement executed
by it effective as of May 30, 1996, in favor of the Agent and the Lenders,
includes a guaranty of all of the obligations, indebtedness and liabilities of
the Borrower under the Credit Agreement as amended by this letter, (b)
represents to the Agent and the Lenders that such Guaranty remains in full force
and effect and shall continue to be its legal, valid and binding obligation,
enforceable against it in accordance with its terms, and (c) agrees that this
letter and all documents executed in connection herewith do not operate, and
that the prior amendments to the Credit Agreement and all documents executed in
connection therewith have not operated, to reduce or discharge its obligations
under such Guaranty.

     This letter may be executed in any number of identical counterparts, each
of which when so executed shall be deemed an original and all of which taken
together shall constitute one and the same agreement. Except as expressly
amended by this letter, the Credit Agreement is and shall be unchanged

     THIS LETTER SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS
OF THE STATE OF TEXAS AND AS APPLICABLE, THE LAWS OF THE UNITED STATES OF
AMERICA.

     THIS WRITTEN LETTER AND THE OTHER LOAN DOCUMENTS CONSTITUTE A "LOAN
AGREEMENT" AS DEFINED IN SECTION 26.02(a) OF THE TEXAS BUSINESS & COMMERCE CODE,
AND REPRESENT THE FINAL AGREEMENT AMONG THE PARTIES AND MAY NOT BE CONTRADICTED
BY EVIDENCE OF PRIOR, CONTEMPORANEOUS OR SUBSEQUENT ORAL AGREEMENTS OF THE
PARTIES.

     THERE ARE NO UNWRITTEN ORAL AGREEMENTS AMONG THE PARTIES.

<PAGE>   3
CRAFTMADE INTERNATIONAL, INC. et al
August 11, 1999
Page 3

                                             CHASE BANK OF TEXAS, N.A., as Agent
                                             and as Lender

                                             By:    /s/ Jerry G. Petrey
                                                --------------------------------
                                             Name:  Jerry G. Petrey
                                             Title: Vice President

                                             FROST NATIONAL BANK

                                             By:    /s/ D. Michael Randall
                                                --------------------------------
                                             Name:  D. Michael Randall
                                             Title: Senior Vice President

CRAFTMADE INTERNATIONAL, INC.
DUROCRAFT INTERNATIONAL, INC.
TRADE SOURCE INTERNATIONAL, INC.

All By: /s/ James R. Ridings
       -----------------------------
Name:   James R. Ridings
Title:  Chief Executive Officer

C/D/R INCORPORATED

By:     /s/ Clifford Crimmings
       -----------------------------
Name:   Clifford Crimmings
Title:  President<PAGE>   1
                                                                   EXHIBIT 10.19

[CHASE LOGO]

                       SIXTH AMENDMENT TO CREDIT AGREEMENT

         THIS SIXTH AMENDMENT TO CREDIT AGREEMENT (this "Amendment") dated
effective as of November 12, 1999 (the "Effective Date"), is among CRAFTMADE
INTERNATIONAL, INC., a Delaware corporation, DUROCRAFT INTERNATIONAL, INC., a
Texas corporation, TRADE SOURCE INTERNATIONAL, INC., a Delaware corporation
(jointly and severally, "Borrower"), C/D/R INCORPORATED, a Delaware corporation
("C/D/R"), CHASE BANK OF TEXAS, NATIONAL ASSOCIATION, as agent ("Agent"), and
CHASE BANK OF TEXAS, NATIONAL ASSOCIATION and THE FROST NATIONAL BANK
(collectively, "Lenders").

                              PRELIMINARY STATEMENT

         Agent, Lenders and Borrower are parties to a Credit Agreement dated as
of May 30, 1996, as amended by a First Amendment dated as of October 8, 1996, a
Second Amendment dated as of November 1, 1997, a Third Amendment dated as of
July 1, 1998, a Fourth Amendment dated as of April 2, 1999 and a Fifth Amendment
(in letter form) dated as of August 11, 1999 (as so amended, the "Credit
Agreement"). All capitalized terms defined in the Credit Agreement and not
otherwise defined in this Amendment shall have the same meanings herein as in
the Credit Agreement.

         Agent, Lenders and Borrower have agreed to amend the Credit Agreement
to increase principal amounts available to be borrowed by Borrower, subject to
the terms and conditions of the Credit Agreement, from $14,000,000 to
$16,000,000, to extend the maturity of such indebtedness, and to effect certain
other desired changes.

         NOW, THEREFORE, in consideration of the premises and other good and
valuable consideration, the receipt and sufficiency of which are hereby
acknowledged by the parties, Agent, Lenders and Borrower hereby agree as
follows:

         Section 1. Addition of Definition. The following definition is hereby
added to Section 1 of the Credit Agreement:

         ""Fixed Charge Coverage Ratio" means (a)(i) EBITDA, less (ii) cash Tax
Expense, less (iii) the dollar amount of treasury stock repurchases by Borrower,
divided by (b)(i) principal payments made on Debt (including, without
limitation, prepayments of Mortgage Debt), plus (ii) Interest Expense, plus
(iii) cash dividends. With respect to both clauses (a) and (b) above, such
amounts shall be determined for the period beginning on and including October 1,
1999 through and including the most recently completed fiscal quarter, until
such time as the four most recently completed fiscal quarters are taken into
account in such determination, at which time and thereafter only the four most
recently completed fiscal quarters."
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         Section 2. Amendment of Definition. The following definitions in
Section 1 of the Credit Agreement are amended to read in their entirety as
follows:

         ""Applicable Rate" means:

                  (a) during the period that an Advance is a Prime Rate Advance,
         the Prime Rate minus 1/2 of one percent (0.5%); and

                  (b) during the period that an Advance is a Eurodollar Advance,
         the Eurodollar Rate plus (i) at all times when the most recent
         compliance certificate delivered in accordance with SECTION 7.1(C)
         shows that the Funded Debt to EBITDA Ratio is less than 1.0 to 1.0, one
         and one-quarter percent (1.25%), and (ii) at all times when the most
         recent compliance certificate delivered in accordance with SECTION
         7.1(C) shows that the Funded Debt to EBITDA Ratio is greater than or
         equal to 1.0 to 1.0, one and one-half percent (1.5%)."

         ""Borrowing Base" means, at any particular time, an amount equal to the
         sum of (a) eighty percent (80%) of Eligible Accounts, plus (b)
         fifty-five percent (55%) of Eligible Inventory; provided, however, that
         at no time shall the Eligible Inventory component of the Borrowing Base
         ever be greater than percent (50%) of the aggregate amount of
         outstanding Advances."

         ""Commitments" means, as to either Lender, the obligation of such
         Lender to make Advances thereunder in an aggregate principal amount not
         to exceed $8,000,000, and "Commitments" means such obligation of all
         Lenders, as such amounts may be reduced pursuant to Section 2.7 or
         otherwise."

         ""Funded Debt to EBDITA Ratio" means, at any particular time, the ratio
         of (a) Funded Debt (including Senior Bank Debt and Capital Lease
         Obligations, but excluding Mortgage Debt) to (b) EBITDA."

         ""Termination Date" means 11:00 a.m. Dallas, Texas time on November 30,
         2001, or such earlier date and time on which the Commitments terminate
         as provided in this Agreement."

         Section 3. Amendment of Section 8.1. The next to last paragraph of
Section 8.1 of the Credit Agreement is hereby amended to read in its entirety as
follows:

                  "Without limiting the foregoing, C/D/R will not incur, create,
         assume or permit to exist, and will not permit any subsidiary of C/D/R
         to incur, create, assume or permit to exist, any Debt, except unsecured
         Debt in an aggregate amount not to exceed $100,000 at any one time
         outstanding."

         Section 4. Amendment of Section 8.4. The last proviso of Section 8.4 of
the Credit Agreement is hereby amended to read in its entirety as follows:

         "provided, however, that Borrower may purchase treasury stock so long
         as the Consolidated Debt to Consolidated Tangible Net Worth Ratio is
         not greater than 2.0 to 1.0, and as a result of such purchase would not
         become over 2.0 to 1.0, in each case as evidenced by a Treasury Stock
         Purchase Compliance Certificate, substantially in the form of EXHIBIT
         F-1 attached

SIXTH AMENDMENT TO CREDIT AGREEMENT - Page 2

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         hereto, submitted to Agent showing the effect of any potential treasury
         stock purchases contemplated by Borrower during a thirty (30) day
         period commencing on the earlier of (i) the date such Treasury Stock
         Purchase Compliance Certificate is sent to Agent or (ii) the date of
         the initial treasury stock purchase covered by such certificate."

         Section 5. Amendment of Section 9.3. Section 9.3 of the Credit
Agreement is hereby amended to read in its entirety as follows:

         "Section 9.3 Funded Debt to EBITDA Ratio. Borrower will at all times
         maintain a Funded Debt to EBITDA Ratio, determined monthly with respect
         to the twelve most recently completed calendar months, of not greater
         than 1.75 to 1.0."

         Section 6. Replacement of Section 9.4. Section 9.4 of the Credit
Agreement (captioned "EBITDA of Trade Source") is hereby deleted in its
entirety, and replaced in its entirety by the following:

         "Section 9.4 Fixed Charge Coverage Ratio. Borrower will maintain a
         Fixed Charge Coverage Ratio of greater than 1.0 to 1.0 as of the end of
         each fiscal quarter of Borrower."

         Section 7. Amendment of Exhibits. Exhibits A, C, F and F-1 to the
Credit Agreement are hereby amended in their entireties to be in the form of
Exhibits A, C, F and F-1, respectively, to this Amendment.

         Section 8. Addition of Section 7.12. A new Section 7.12 of the Credit
Agreement is hereby added, to read in its entirety as follows:

         "Section 7.12. Administrative Fee. Borrower will pay Agent an
administrative fee pursuant to the terms of that certain letter between them
regarding such fee. "

         Section 9. Representations; No Event of Default. Borrower hereby
represents and warrants to Agent and Lenders that:

-        the execution, delivery and performance of this Amendment and any and
         all other Loan Documents executed and delivered in connection with this
         Amendment have been authorized by all requisite corporate action on the
         part of Borrower and Guarantor and will not violate the certificate of
         incorporation or articles of incorporation (or other charter
         documents), as applicable, or bylaws of any of Borrower and Guarantor;
         and

-        neither the certificate of incorporation or articles of incorporation
         (or other charter documents), as applicable, nor bylaws of any of
         Borrower and Guarantor have been amended or revoked since May 30, 1996,
         except as certified in writing to Agent and Lenders by Borrower or
         Guarantor contemporaneously with the execution and delivery of this
         Amendment; and

-        the representations and warranties contained in the Credit Agreement,
         as amended hereby, and any other Loan Document, are true and correct on
         and as of the date hereof as though made on and as of the date hereof;
         and

SIXTH AMENDMENT TO CREDIT AGREEMENT - Page 3

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-        as of the date of this Amendment, no Event of Default has occurred and
         is continuing and no event or condition has occurred that with the
         giving of notice or lapse of time or both would be an Event of Default;
         and

-        each of Borrower and Guarantor is in full compliance with all covenants
         and agreements contained in the Credit Agreement, as amended hereby.

         Section 10. Conditions Precedent. The effectiveness of this Amendment
shall be subject to the following conditions precedent:

-        Each Lender shall have received a promissory note of Borrower payable
         to the order of such Lender, in substantially the form of EXHIBIT A
         hereto, with appropriate completion, which promissory note shall be in
         modification, increase and replacement of (but not in extinguishment
         of) those certain promissory notes in the form of EXHIBIT A to the
         Credit Agreement, and dated as of July 1, 1998 and in the stated
         maximum principal amount of $7,000,000; and

-        Lenders shall have received a Secretary's Certificate from the
         secretary or assistant secretary of Borrower and Guarantor certifying
         and attaching appropriate corporate resolutions regarding the
         transactions contemplated hereby, and statements of incumbency; and

-        Lenders shall have received such other documents incidental and
         appropriate to the transactions provided for herein as Lenders or their
         counsel may reasonably request, and all such documents shall be in form
         and substance reasonably satisfactory to Lenders; and

-        All legal matters incident to the consummation of the transactions
         contemplated hereby shall be reasonably satisfactory to special counsel
         for Lenders retained at the expense of Borrower.

         Section 11. Guaranty. C/D/R hereby acknowledges, consents and agrees to
this Amendment and (a) acknowledges that its obligations under that certain
Guaranty Agreement executed by it effective as of May 30, 1996, in favor of
Agent and Lenders, includes a guaranty of all of the obligations, indebtedness
and liabilities of Borrower under the Credit Agreement as amended by this
Amendment (specifically including the increased principal amount of $16,000,000
potentially available under the Credit Agreement), (b) represents to Agent and
Lenders that such Guaranty remains in full force and effect and shall continue
to be its legal, valid and binding obligation, enforceable against it in
accordance with its terms, and (c) agrees that this Amendment and all documents
executed in connection herewith do not operate, and that the prior amendments to
the Credit Agreement and all documents executed in connection therewith have not
operated, to reduce or discharge its obligations under such Guaranty.

         Section 12. Ratification. Borrower acknowledges that each of the Loan
Documents is in all respects ratified and confirmed, and all of the rights,
powers and privileges created by this Amendment or under the Loan Documents are
ratified, extended, carried forward and remain in full

SIXTH AMENDMENT TO CREDIT AGREEMENT - Page 4

<PAGE>   5

force and effect except as the Credit Agreement is amended by this Amendment.
Except as expressly amended by this Amendment, the Credit Agreement is and shall
be unchanged.

         Section 13. Liens and Security Interests. Borrower hereby extends and
renews the Liens and security interests previously granted to Agent and Lenders
and agrees that this Amendment shall in no manner affect or impair any Liens or
security interests previously granted. Borrower hereby acknowledges that such
Liens and security interests are valid and existing.

         Section 14. Counterparts. This Amendment may be executed in any number
of counterparts and by different parties hereto in separate counterparts, each
of which when so executed shall be deemed an original and all of which taken
together shall constitute but one and the same agreement.

         Section 15. Joint and Several; Loan Documents. Any and all obligations
of Borrower under the Loan Documents are joint and several, whether or not
expressly so stated. This Amendment shall be included within the definition of
"Loan Documents" as used in the Agreement. The "Agreement" as used in the Credit
Agreement is a reference to the Credit Agreement as amended by this Amendment.

         Section 16. Enforceability. Borrower and Guarantor hereby represent and
warrant that, as of the date of this Amendment, the Credit Agreement and all
documents and instruments executed in connection therewith are in full force and
effect and that there are no claims, counterclaims, offsets or defenses to any
of such documents or instruments.

         Section 17. Governing Law. THIS AMENDMENT SHALL BE GOVERNED BY AND
CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF TEXAS AND AS APPLICABLE,
THE LAWS OF THE UNITED STATES OF AMERICA.

         THIS WRITTEN AMENDMENT AND THE OTHER LOAN DOCUMENTS CONSTITUTE A "LOAN
AGREEMENT" AS DEFINED IN SECTION 26.02(a) OF THE TEXAS BUSINESS & COMMERCE CODE,
AND REPRESENT THE FINAL AGREEMENT AMONG THE PARTIES AND MAY NOT BE CONTRADICTED
BY EVIDENCE OF PRIOR, CONTEMPORANEOUS OR SUBSEQUENT ORAL AGREEMENTS OF THE
PARTIES.

         THERE ARE NO UNWRITTEN ORAL AGREEMENTS AMONG THE PARTIES.

         IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be
executed effective as of the Effective Date.

                  BORROWER:                CRAFTMADE INTERNATIONAL, INC.

                                           By:      /s/ James R. Ridings
                                              --------------------------------
                                           Name:    James R. Ridings
                                           Title:   Chief Executive Officer

SIXTH AMENDMENT TO CREDIT AGREEMENT - Page 5

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                                           DUROCRAFT INTERNATIONAL, INC.

                                           By:      /s/ James R. Ridings
                                               ------------------------------
                                           Name:    James R. Ridings
                                           Title:   Chief Executive Officer

                                           TRADE SOURCE INTERNATIONAL, INC.

                                           By:      /s/ James R. Ridings
                                              ------------------------------
                                           Name:    James R. Ridings
                                           Title:   Chief Executive Officer

                  GUARANTOR:               C/D/R INCORPORATED

                                           By:      /s/ Clifford Crimmings
                                              ------------------------------
                                           Name:    Clifford Crimmings
                                           Title:   President

                  LENDERS:                 CHASE BANK OF TEXAS, NATIONAL
                                           ASSOCIATION, as Agent and as Lender

                                           By:      /s/ Jerry G. Petrey
                                              -----------------------------
                                           Name:    Jerry G. Petrey
                                           Title:   Vice President

                                           THE FROST NATIONAL BANK

                                           By:      /s/ D. Michael Randall
                                              -----------------------------
                                           Name:    D. Michael Randall
                                           Title:   Senior Vice President

SIXTH AMENDMENT TO CREDIT AGREEMENT - Page 6

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