Thanks

True it might already be in the public domain.

What the lights appear to (my guess) is calculating the distance to nearby objects and prevent Point light blow out if close to say a ceiling, yet lighting the room below. Again that ias a wild ass guess on my part

If it's doing what you think, BB might even be the source of the shader. Have a look at: http://www.renderosity.com/mod/forumpro/?thread_id=2868367&page_number=2

There is a problem with the inverse square falloff, if things are too close too the light the intensity is too high. BB did adress that with an addition to the wall shaders, or with a light shader. The thread linked should contain the needed information.

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