... bulb 1,watt:7/9/11/15/20/25w 2,power factor:0.55 3,lifetime:8000h 4,certificate:CE,ROSH Flourescent bulb ... 30% higher than GB3,Long lifetime>=8000hours4,Brightness of the bulb is five times greater than a lamp of same wattage ... areas house, hotels, office,commercial buildings etc. CE ROSH Flourescent bulb