This convenient standard medium base incandescent soft white 3-way light bulb has one low 20 watt setting that's great as a security light in a lamp on a timer. Provides ample illumination at a wattage that uses little electricity, with a long average life of 1,200 hour or 1.1 years. The 135 and 150 watt settings provide beautiful and bright light for general household tasks Incandescent 3-way security light bulb20/135/150 wattSoft white finishStandard E26 medium baseA21 shape1200 hour or 1.1 year average bulb life120 volt