In other words,
setcoloreffect r,g,b,a;
is how it works. for example:
NPC Code:
setcoloreffect 1,1,0,0.5;
Would make a yellow light. r is the amount of read in the light, g is for the green and b is for the blue. a is the alpha blending (sp?) in it. People say that all of them have to be a number between 0 and 1, but only the alpha does. for the r, g & b, you can use values from 0 to 255 as well as 0 - 1.