I purchased a sheet of this to use as diffusion for some LED PAR cans also purchased from Thomann. Lee is a leading manufacturer of gel for the lighting industry, so there was no problem with the performance of the product. The frost is durable, cuts easily, and obviously being used with LED, will last a very very long time - in fact I am still using it 6 years later. The frost does a good job of blending the beam from individual LEDs in the PAR to reduce colour fringing, and also takes the glare out of the beam if the PAR is pointing at someone directly.