I think you're talking about the effect where "secondary colors" made by mixing, say, R and G together have a maximum brightness (or I called it I for intensity

I think you're talking about the effect where "secondary colors" made by mixing, say, R and G together have a maximum brightness (or I called it I for intensity) that is twice as high as that of pure R because twice as many LEDs are on. This is the main reason I like it for my spotlights, it's way weirder if the apparent brightness of the spot changed as it went through a rainbow at fixed saturation (or from unsaturated to fully saturated even). Instead, I make it so that for secondary colors each individual emitter is half as bright by keeping the sum(R,G,B) constant (if it's RGB) as one of the main parameters. It's a tradeoff, it definitely only gets half as bright for the secondary colors. I think this is for the best in practice, otherwise white would be thrice as bright again, the software limit makes more sense to me than bouncing spot brightnesses. For computer display colors, I don't think I am an expert enough to speak to it. I know about spotlight color schemes because that's what I build =)