i built a small unit that has 3 bright LEDs (Red, Green, Blue with 15 degree beam pattern ) there are 3 buttons on this unit to change the intensity of each LED. (to blend the RGB to make many different color variations) when testing this unit approx. 3 feet from the ground, the colors don't blend very well( you can see Red,Green, and Blue distinctively, intstead of uniformly) to try to correct this issue, i sandblasted a half-sphere plastic cap and put it over the LEDs. this seems to work pretty well because it diffuses the colors making for a more uniform blend of colors. the only problem is, this cap reduces the light output. can anyone suggest another method to diffuse the colors without losing much light intensity?