I am working on a lighting project. Right now I have a typical yellow LED (like so http://www.sparkfun.com/products/532) mounted in a 5" tube. It is shining through a frosted acrylic sheet at the end of the tube, 2" away from the LED. it creates a circle of intense light on the acrylic that is about 3" in diameter and then some ambient light around it. Are there any LEDs that are designed to diffuse light more so that the circle of intense light would widen and be a bit less bright?