... : 50cmDiameter of opening hole: 10cm Maximum testing wattage: 300W. Input voltage: 100-250V AC. Testing lamps: energy saving lamps , tubes , ... satisfaction as our core values. Presently, SHENZHEN LITE develop a new range products ---- full range of measurement of lights to help ... saving and environmental lighting products all the time. lumen tester(LT-SM901)Power , Pf, Voltage ,Current,Apc,cct,lumen