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The bulb must be made of fused silica (quartz) or a high-melting-point glass (such as aluminosilicate glass). Since quartz is very strong, the gas pressure can be higher, [14] which reduces the rate of evaporation of the filament, permitting it to run a higher temperature (and so luminous efficacy) for the same average life. The tungsten ...
Some bulbs have a phosphor coating on the inner side of the outer bulb to improve the spectrum and diffuse the light. In the mid-1980s a new type of metal-halide lamp was developed, which, instead of a quartz (fused silica) arc tube as used in mercury vapor lamps and previous metal-halide lamp designs, use a sintered alumina arc tube similar to ...
The bulb's longevity has been attributed to the high quality of its manufacture, [4] it being seldom turned off, [5] [6] and its low wattage. [5] [6] Originally a 60-watt bulb, the light has for many years emitted dim light equivalent to a 4-watt bulb, about the strength of a nightlight. [4]
In theater, a worklight is a high-intensity light fixture which is used to illuminate the stage for the benefit of technicians. Technicians use these lights, rather than the stage lights for a number of reasons. Firstly, it takes much less technical knowledge to turn on worklights, so even people with no knowledge of electrics can turn them on.
Brand new high-intensity discharge lamps make more visible light per unit of electric power consumed than fluorescent and incandescent lamps, since a greater proportion of their radiation is visible light in contrast to infrared. However, the lumen output of HID lighting can deteriorate by up to 70% over 10,000 burning hours.
An incandescent light bulb, incandescent lamp or incandescent light globe is an electric light with a filament that is heated until it glows. The filament is enclosed in a glass bulb that is either evacuated or filled with inert gas to protect the filament from oxidation. Electric current is supplied to the filament by terminals or wires ...
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