15-05-2015, 04:03 PM
History of Halogen Lamp
A carbon filament lamp using halogen to prevent darkening of the envelope was patented in 1882 .
The chlorine-filled "Novak" lamps were marketed in 1892
The use of iodine was proposed in 1933
Elmer Fridrich and Emmet Wiley developed the halogen lamp at General Electric in Nela Park, Ohio in 1955
Elmer Fridrich developed the first halogen tungsten lamp prototypes with Emmitt Wiley in 1953/1959 .
The team later developed the double ended halogen lamp in 1959
Patents were issued in 1959 .
The halogen was improved upon by other engineers so that it was cheaper to produce and market in 1960.
Definition of Halogen Lamp
A halogen lamp, also known as a tungsten halogen lamp or quartz iodine lamp, is an incandescent lamp that has a small amount of a halogen such as iodine or bromine added. The combination of the halogen gas and the tungsten filament produces a halogen cycle chemical reaction which redeposit evaporated tungsten back on the filament, increasing its life and maintaining the clarity of the envelope. Because of this, a halogen lamp can be operated at a higher temperature than a standard gas-filled lamp of similar power and operating life, producing light of a higher luminous efficacy and color temperature.