... to identify or compare the quality of LED lamps,fluorescent lamps, halogent or incandescent lamps,or appliances from ... or AC 100-277V within 300W at the same time.2. Testing parameters: Lux, CCT(color temperature), Voltage, ... is the same as the testing voltage. 100-277V 2. Testing time is only about 10 seconds.3. ... warranty. DC AC Lux Meter for LED CFL lamp with digital volt meter DC AC Lux Meter for LED ...