... factor:80 4, Certificates: CE, ROHS, UL led flat panel 21WPart number: BDL-P21-001Wattage: 21WDimensions: 600mm×600mmWorking ... Wide voltage and constant current design, solid state, high shock & vibration resistant, 80% saving in energy ... hospital, schools, factories, commercial lighting, shopping malls, supermarkets, kitchen, display, backlight, home indoor lighting and so on. led flat panel 21W