LED lights diffusers:
LED diffuser is just a tin plate between LED LGP and the cover. It can evenly guild the light generated by LGP and evenly transmitted them to the cover. It also can be seen as a kind of shield for LGP, blocking or frosting the grid. Normally, diffusers use sheets of acrylic 2.0 or other materials like PC. Acrylic sheets have a higher luminousness but cost much less. In anti-aging aspect, PC materials have a better performance than acrylic sheets. Manufacturers for LED panel lights often take tradeoff between them, finding a suitable balance. Rich and powerful LED giants may even develop their owner LED diffusers, while small and medium sized companies still relies on other LED diffuser factories. After LED diffusers being mounted, most grids on LGP should be covered (totally unseen) and meanwhile designers still need to keep the luminousness as much as 90%. The luminousness of acrylic sheets is around 92%, while that of PC materials is around 88%. Manufacturers selected suitable diffusers materials depending on their specific needs. Currently, most LED manufacturers preferred acrylic sheets.
Not all light can pass though LGPs and diffusers. Some of them will slip into the backside of LED panel lights. Reflectors can reflect more than 90% of backward light, which can dramatically increase the lighting efficiency.
Covers for LED panel lights are usually made by aluminum alloy (1060) and also can be considered as part of cooling section. A good cover can effectively reduce the light attenuation and extend the service life of product.
LED lighting products work under DC. They are pretty vulnerable to voltage fluctuations. Even tiny change in voltage may cause violent vibration to LED current. As we all know, LEDs need very rigid working environment – a constant current. High-frequency Derivers are typically developed for LED lighting products, using constant current power suppliers. This module has higher efficiency. PF can reach 0.95. Another module applies constant voltage/current power suppliers, which provide both constant voltage and constant current. This type of drivers have higher stabilities, but cost more than the former, and also have lower efficiency. Constant voltage/current power suppliers are mostly used in export products.