The basic design of the incandescent lamp has not changed much since the late 1800s, when Thomas Alva Edison successfully produced the fist operational electric light bulb. The filament inside an incandescent lamp must be protected so that oxygen does not reach it and cause it to evaporate on contact. Most incandescent lamps are either vacuum-sealed or gas-filled. Incandescent lamp filaments are made of tungsten. Tungsten is a metal that can operate at very high temperatures without evaporating too quickly an resulting in early lamp failure. Incandescent filaments only convert about 10 percent of the energy used into visible light, so it is necessary to use a material that can withstand extremely high temperatures. Most lamps use a coiled filament design, which has been found to be stronger and deliver better performance. -1500 average rated hours-25-Watt medium base-Clear light bulb
- Clear bright light. - 120 Volt - Regular (Medium) Screw Base - 5 Inch Diameter - For use in decorative hanging lamps. - 100 Watt - Energy Used -...
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97493 Features: -Light bulb.-Base: 3 Contact standard E26d.-Primary application: 3-Way.-Carded.-A21 bulb type.-1200 Life hours.-305 Lumens.-Voltage: 120.-Watt: 30. Color/Finish: -Finish: Soft white.-Color temperature: 2800 Kevil. : -Overall dimensions: 2.63" Dia x...