Overlit "orange" will blow out as yellow - pure red will not.

You must have some green in there as well as red.

 

Suppose you have Red = .9 and Green = .1.

Then with Ambient_Value = 10, you multiply both by 10.

You get Red = 9, and Green = 1.

Since Red = 9 is a hypercolor (because a monitor cannot display red above 1) this displas as Red=1 and Green = 1, i.e. Yellow.

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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)