tungsten lamp

noun

tungsten lamp

a lamp in which light is produced by a tungsten filament heated to incandescence by an electric current. The glass bulb enclosing the filament contains a low pressure of inert gas, usually argon. Sometimes small amounts of a halogen, such as iodine, are added to improve the intensity ( tungsten-halogen lamp )

tungsten lamp

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First recorded in 1905–10

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How many candle power should a 20-watt tungsten lamp give if its efficiency is one watt per candle power?

Ordinary arc lamps, and even flame arc lamps, are being displaced by the modern high-candle-power gas-filled tungsten lamp.

Then Ruth touched the trigger of the big tungsten lamp, and the spotlight shot the herd at about the middle of its advance wave.

One 25-watt tungsten lamp or its equivalent provided for every 20 seats will give fairly good illumination in a small theater.

What is the "efficiency" of a 40-watt tungsten lamp if it gives 34 candle power?

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