... shape brightness obvioysly, very little facular.3, For traditional tubes, optical decay reached 20% after 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, ... , repair , alteration without Manufacturer`s authorization.3.Please deliver the failure products by original packing ...