... long weather, never fade, the useful life of up to 5 to 8 years. Feature:(1)Durability: built-in light source with ... product, almost no risk of fracture.(4)Light transmission: up to 93% transmittance excellent, soft light and bright.(5)Flame resistance ... lenses, mirrors, prisms, TV screen, the light transmittance of the Fresnel lens, the camera zero. 3. The preparation of a variety of ...