... wall light, office ceiling light, pathway light, passageway light, shopping mall ceiling light, gas station light, underground warehouse light, indoor parking, class room, school light, garment ... LED at the same illuminance.1. Luminous efficiency: over 70 to 75lm/w2. Lumen maintain (2,000hours) (%) ... low luminance decline: e.g. luminous flux over 70% after 50,000 hours lighting.3. Wide power ...