EXHIBIT 99.1


        CERTIFICATION UNDER SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002


Jay T. Flatley and Timothy M. Kish hereby certify that:

1.  They are the Chief Executive Officer and Chief Financial Officer,
respectively, of Illumina, Inc.

2.  The Form 10-Q report of Illumina, Inc. that this certification accompanies
fully complies with the requirements of section 13(a) or 15(d) of the Securities
Exchange Act of 1934.

3.  The information contained in the Form 10-Q report of Illumina, Inc. that
this certification accompanies fairly presents, in all material respects, the
financial condition and results of operations of Illumina, Inc.

Dated:  August 14, 2002

                                       By: /s/ Jay T. Flatley
                                           -------------------------------------
                                           Jay T. Flatley
                                           President and Chief Executive Officer

                                       By: /s/ Timothy M. Kish
                                           -------------------------------------
                                           Timothy M. Kish
                                           Chief Financial Officer