Fluorescent lamps are phosphorous-coated tubes filled with a low-pressure mercury vapor. Light is produced by passing an electric arc between tungsten cathodes at opposite ends of the tube. This causes the mercury vapor to generate a radiant energy. Product Features 10000 Average rated hours 40-Watt medium base 5000K natural light bulb Energy Saver
Satco S8522 60 Watt 440 Lumens A19 Incandescent Rough Service Light Bulb, 4-Pack Product Features 5000 Average rated hours 60-Watt medium base Frosted bulb