double tube, voltage: 150-260v; 9w/13w/16w/ ... power factor: 0.98; lum: 14.5Kcd/m2 double tube super light LampThe brightness of its light is more ... light, average life is 10000 hours(technical life)Double tube can completely shield the infrared and ultraviolet radiation ... tube; it can be used in office, shop, factory, school, hotel, metro, meeting room, family, library and so on. Enery saving double tube ...