The casting of LED's require clear products. There are multiple factors which can influence a good light, such as: Light output of LED's, distance between LED's, width and depht of the profiles, product with it used for the casting, hardness of the material, indoor or outdoor application.
Products which can be used as casting resin can be crystal clear, diffused or colored. This has an effect on the light output.
At Permacol we look together with you to find the right solution for your product.