... light and to improve the tube shape brightness obvioysly, very little facular.3, For traditional tubes, optical ... 200 hrs usage, but for Ervan led tube, optical decay is less than 2% after 1,000hrs ... long time. Under a normal environment, the optical decay can keep within 8% after 30,000 ... Tube sdopts special PC(Polycarbonate) plastic with soft light, it is unbreackable, shake-resist, and applicable ...