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Satco S3721 130V Medium Base 40-Watt A15 Appliance Light Bulb, Frosted

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Product Overview

Satco S3721 130V Medium Base 40-Watt A15 Appliance Light Bulb, Frosted, 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.

Specifications

Manufacturer Satco
Mfg Part# S3721
SKU 205674874
UPC 045923037214
UPC 14 00045923037214
Physical
Weight 1
Features
2500 average rated hours
40-Watt medium base
Frosted bulb
loading
$1.99 + $8.49 shipping
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