... Light source in a strio to diffuse light and to improve the tube shape brightness obvioysly, very little facular.3, For traditional tubes, optical ... hrs usage, but for Ervan led tube, optical decay is less than 2% after 1, ... time. Under a normal environment, the optical decay can keep within 8% after 30 ... sdopts special PC(Polycarbonate) plastic with soft light, it is unbreackable, shake-resist, and ...