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Hi SolarFlower, very interesting. I'm trying to create a light for video shooting, and I've been struggling for a long time on a problem that maybe you help me solve. I have a light source made of 4 powerful white COB (planar, lambertian) LEDs, that form a 80mm x 80mm light emitting source. What I want to do is to concentrate this source into a collimated beam, with the final purpose of using a floating Fresnel lens in order to adjust the angle of the final beam between, let's say, 10 and 60 degrees. This is very useful when you have to deal with studio lighting. Maybe you could help me? I'm spending time and money with little results... thanks! (and sorry for the poor English :))