Important to note. The "Radius" setting isn't really a COLOR.  It's a DISTANCE in millimeters. So in the case of 3.67, 1.37, and .68, that reflects how much the light scatters for the Red, Green, and Blue channels, respectively. In other words, the Red channel scatters 3.67 millimeters, the green channel scatters less at 1.37 millimeters, and the Blue channel scatters the least, at .68 millimeters. 

And if I'm not mistaken, the scatter scale in Poser is a value that would convert the values from a millimeter value to a centimeter value (hence, you multiply 1 millimeter by .1 to get 1 centimeter). I'm not 100% certain on this though.