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When shot outdoors, tungsten film produces a strong blue cast, an effect which is often used purposely to create different color contrasts. In the motion picture industry the use of underexposed tungsten-balanced film in an outdoor setting is a common way of producing a " day for night " effect, whereby film shot during the daytime looks as if ...
The name "Tungsram" is a portmanteau of tungsten (/ ˈ t ʌ ŋ s t ən / TUNG-stən) and wolfram (/ ˈ w ʊ l f r əm / WUUL-frəm), the two common names of the metal used for making light bulb filaments. Before becoming nationalized by the Communist government in 1945, the company was the world's third largest manufacturer of light bulbs and ...
The company was founded in 1962 in Renens ... The continuous lighting uses tungsten bulbs with a colour temperature of around 3200 K instead of daylight-balanced ...
Hiram S. Maxim was the chief engineer at the US Electric Lighting Co. [52] After the great success in the United States, the incandescent light bulb patented by Edison also began to gain widespread popularity in Europe as well; among other places, the first Edison light bulbs in the Nordic countries were installed at the weaving hall of the ...
With HMI bulbs, color temperature varies significantly with lamp age. A new bulb generally will output at a color temperature close to 15,000 K during its first few hours. As the bulb ages, the color temperature reaches its nominal value of around 5600 K or 6000 K. With age, the arc length becomes larger as more of the electrodes burn away.
Photoflood lamps are a type of incandescent light bulb designed for use as a continuous light source for photographic lighting. [1] The filaments of such lamps are operated at much higher temperatures than is the case for standard, general lighting service lamps. The result is a brilliance of light much higher than the lamp's wattage rating ...
In 1919, San Francisco introduced tungsten bulbs on Van Ness Avenue, between Vallejo and Market Street, replacing gas mantles and arc lamps. [1] The city used two 250-candlepower tungsten lamps per column, on sixteen columns for every block. [1]
However, the overall bulb envelope temperature must be significantly higher than in conventional incandescent lamps for this reaction to succeed: it is only at temperatures of above 250 °C (482 °F) [11] on the inside of the glass envelope that the halogen vapor can combine with the tungsten and return it to the filament rather than the ...