... reached 20% after 200 hrs usage, but for Ervan led tube, optical decay is less than 2% after 1,000hrs usage. ... 30,000 hrs.4, Convenient to deliver. Ervan LED Tube sdopts special PC(Polycarbonate) plastic with soft light, it is unbreackable ... and unique design3, Isolated power supply4, Euripean safety wired5, PC Cover: clear/frosted availableFunction Feature:1, Designed especially for refrigerators ...