***could test all kinds of lamps ***Multiple functions, ... hole: 10cm Maximum testing wattage: 300W. Input voltage: 100-250V AC. Testing lamps: energy saving lamps , tubes ... CCT, lumen, luminous efficiency , power , power factor , CRI ect . Your trust is our key! Let's work together ... init( { 'aImgSrc': aBigImageSrc } ); } )(); Spectroradiometer(LT-SM901)CRI,Power , Pf, Voltage ,Current,Apc,cct,lumen