I'm trying to create a sodium halide light. The effect of this light is that it only shows a single spectrum (out of the full rainbow of visible light), thus any object that isn't yellow, looks grey or black. I wasn't sure how to go about creating this light source.
Using Cycles . Version 2.79 (haven't had time to invest in 2.8, I know I should. Def will very soon).
Appreciate the help