Supply the lights you use in promos, so they see what they're supposed to do with lights. VSS shaders are far less dependant on lighting than others. But you can't make shaders that don't pay any attention to light levels. If people are going to be stupid and put 250% intensity lights on, then it will look bad. You can't design for them - you simply have to educate them that such lighting is like a blast furnace. And you * could* adjust the shader to work with the blast furnace, but then 90% of other people will complain your stuff is too dark.

Heck, I could make a shader work with 2000% light intensity, but then at 75% intensity it will look like it is lit by a candle 60 feet away.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)