which illustrates an automatic illumination testing system 11 a housing 13 is seen to include an integrating sphere 15 and associated electronics 17 located adjacent the sphere section 15 the integrating sphere 15 is preferably about six inches in diameter and may be commercially available from labsphere inc the front of the automatic illumination testing system 11 includes an exit aperture opening 19 from which light generated from the sphere section 15 leaves the housing 13 the exit aperture opening 19 may have a circular diameter of about one and a half inches as closely adjacent the aperture opening 19 as possible is a target slide 21 operated by an actuation motor 23 the target slide 21 is seen as a vertically mounted target slide but a different embodiment will also be shown later the target slide 21 has an upper clear or through aperture 25 and a lower test pattern aperture 27 the test pattern aperture can be laser cut or have etched images positioned to produce a test pattern of sufficient sharpness and clarity for testing the ability of a two dimensional array to reproduce the test pattern is one measure of its level of perfection to one side of the aperture opening 19 a first wheel 31 is pivotally mounted to the housing 13 and first wheel 31 may preferably be one of a neutral density filter or frequency filter or a combination of both the term u201c frequency filter u201d is a general term herein and includes frequency selective filters which may include band pass high pass low pass low stop high stop and band stop filters first wheel 31 is powered by a first friction.