Satco S7334 40 Watt (150 Watt) 2600 Lumens Hi-Pro Spiral CFL Soft White 2700K Medium Base 120 Volt Light Bulb, Energy Star
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.
