Cyberlight SV - Lamp intensity output question?

:06: Hey, I have six Cyberlight SV's and am working on repairing a few minor issues. I will be posting more threads in the near future as I get to individual problems. However, my question today is:
Why do one of my Cyber SV's look less bright than the other ones when put side by side? I have new lamps in all the units and have cleaned all the insides. Is something about to fail? Is there any test I can do? The lamp alignment screws in the back do not seem to make much difference when adjusted... Thanks! :1zhelp:
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