>>In fade_power 3 case,  color rgb of light_source would mean color and
>>light power, not color/brighntess.
> 
> 
> I think actual light has an inverse square fade thing ( not very
> knowledgeable) so they should all have  fade_power 2, I think.

As you move further away from the light source, the light is spread over 
a greater area. Since area is the square of length, it should indeed by 
fade_power 2.

Andrew @ work.

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