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AvatarThomas An.

I noticed differences in using a black collimator enclosure verses a white enclosure. You get much better results with a white lambert than black Lambert material

If you use a white collimator, the white sidewalls at the very tip will spread a light-glow sideways, defeating the parallel-ray purpose of the collimator. So, once you go white, it would be similar to deleting the collimator housing and leaving the thin rectangular emitter on its own (which is mush easier on the engine but not so good for isolating dispersion effects).