... Power factor, Voltage ,Current,and Annual power consumption;Lux,Color temperature for AC/DC lamp. Detailed Product Description 1.Compact design ... DC/AC LED CFL, halogen lamps tester--Special design for comparing 4 lamps quality meanwhileFunctionTesting power, power factor , ... and annual power consumption(calculated by 10 hrs/day), lux ,color temperature Testing lamps: energy saving lamps , tubes , led ...