... Power factor:80 4, Certificates: CE, ROHS, UL led flat panel 21WPart number: BDL-P21-001Wattage: 21WDimensions: ... sink, No UV or RF interference, Patented heat sink and optical diffuser, longer than incandescent & fluorescents. No mercury ... , hospital, schools, factories, commercial lighting, shopping malls, supermarkets, kitchen, display, backlight, home indoor lighting and so on. led flat panel 21W