... 2 years 3.certificate: CE, RoHS, 4.lifespan:>40,000h LED light bulbFeature: 1) Self designed and developed advanced constant current driver ... , museum, library, super markets, kitchen, corridor, display, backlight, home indoor lighting, and building decorative lighting projects, and so on. Installation ... Take down the bulb.4) Fix the led bulb.5) Turn on the light to check the bulb works well or not ...