I'm with bantha, and I recall BB had a far better solution in the end: light absorbing paint on walls and ceilings, instead of on the lights.

The point is: point/spot light can have inverse linear or inverse square attenuation. At a distance of 1 PNU from those lights, all attenuations produce the same intensity. At longer distances the intensities of linear and square do fall off, at shorter distances they ramp up. The extreme intensities that this can make, can produce intense artefacts in IDL lit scenes.

My personal guess is, that vendor took the solution from this forum, instead of the other way around.  

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Usually I'm wrong. But to be effective and efficient, I don't need to be correct or accurate.

visit www.aRtBeeWeb.nl (works) or Missing Manuals (tutorials & reviews) - both need an update though