Frode Rambusch was quick to see the potential of Thomas Edison's tungsten filament lamp, the light bulb.
12.
Later metal filament lamps became feasible.
13.
In modern colorimeters the filament lamp and filters may be replaced by several light-emitting diodes of different colors.
14.
Twice as efficient as carbon filament lamps, Nernst lamps were briefly popular until overtaken by lamps using metal filaments.
15.
A purely resistive load ( such as a filament lamp, heater or kettle ) exhibits a power factor of 1.
16.
In 1908, Siemens Brothers Dynamo Works Limited opened a metal filament lamp factory in rented premises at Tyssen Street, Dalston, London.
17.
In 1933 in the United States, Westinghouse announced a dual-filament lamp for commercial lighting and a smaller lamp for residential use.
18.
These lamps have higher efficiency than filament lamps, but the carbon rods are short lived and require constant adjustment in use.
19.
Arc lamps were superseded by filament lamps in most roles, remaining in only certain niche applications such as projection, followspots, and searchlights.
20.
This was very clearly visible with early carbon filament lamps : See . talk ) 22 : 04, 21 January 2011 ( UTC)
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