Try Edmund Scientifics they have a 10 lens kit and a 20 lens kit you could experiment with, they are fairly cheap as I recall. I make my lenses myself they are tailored to work with what I'm doing, stock lenses didn't work. I will try to find a source of lens that might work but I haven't had success yet. You need two Plano convex lenses one a little larger than the first one in front of the led. The one in front of the led should exhibit alot of magnification and be as small a diameter to collect the light from the led. Cut off the top of a jumbo 10mm led and thats the type of lens you want in front of your led.