Create An Apparatus For Testing IR Illuminators

I need to create a test apparatus for evaluating IR illuminators that have been in the field for 2 or more years. We use units with several wattages (12, 16, 24, 31, 44) and they have several beam angles (15, 30, 45, 60 and 90 degree). I was looking at testing in an apparatus a new unit and disconnect 1/2 the LED lamps to obtain two data points and compare this with the unit that was in the field. I have one of those handheld testers by Coherent Model LaserCheck. Any suggestions for a test apparatus?

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