As always BB, thank you very much for the information and learning.

Cheers
DR

Quote - A self-lit prop used as an IDL source of light must be either intensely bright or very large.

My IDL wall rectangles are intensely bright - with a luminance of 5 (on the unit scale, where 1 is the brightest value your monitor can show.)

A simple solution would be to copy the colored cellular node from Anth's shader into my light wall, and plug it into the tile node on both Tile_1 and Tile_2. Then the white * 5 rectangles would become those colors times 5.

 

"That government is best which governs the least, because its people discipline themselves."
Thomas Jefferson