... It's practical tester to identify or compare the quality of LED lamps,fluorescent lamps, halogent or incandescent lamps,or appliances ... hrs/day)3. Equiped with different converter for E27, E14, B15, B22,MR16, GU10, G9.Could test different bulbs with different bases. LED AC lux ... warranty. DC AC Lux Meter for LED CFL lamp with digital volt meter DC AC Lux Meter for LED CFL lamp with digital volt meter