This 42 watt soft white compact fluorescent bulb has the light output of a standard 150 watt incandescent bulb. It puts out 2700 initial lumens and a life span of 8000 hours. It will save energy and last 10 times longer than a 150 watt soft white light bulb. For use in medium base standard house hold lighting fixtures. Bulb is 8 in tall and 3 in diameter.