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Halogen lamp (105 W) for replacement purposes with an E27 screw base A close-up of a halogen lamp capsule A halogen lamp (also called tungsten halogen , quartz-halogen , and quartz iodine lamp) is an incandescent lamp consisting of a tungsten filament sealed in a compact transparent envelope that is filled with a mixture of an inert gas and a ...
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.
Luminous efficacy can be normalized by the maximum possible luminous efficacy to a dimensionless quantity called luminous efficiency.The distinction between efficacy and efficiency is not always carefully maintained in published sources, so it is not uncommon to see "efficiencies" expressed in lumens per watt, or "efficacies" expressed as a percentage.
Xenon, or high-intensity discharge (HID), lighting provides brighter headlights and increases visibility of many peripheral objects (e.g. street signs and pedestrians) left in the shadows by standard halogen lighting. However, the bright headlights have given rise to complaints about glare. [10]
Like other gas-discharge lamps such as the very-similar mercury-vapor lamps, metal-halide lamps produce light by ionizing a mixture of gases in an electric arc.In a metal-halide lamp, the compact arc tube contains a mixture of argon or xenon, mercury, and a variety of metal halides, such as sodium iodide and scandium iodide. [7]
Under ECE Regulation 37, which governs automotive filament lamps in most of the world, the H1 lamp's nominal rating is 55 W at 12 V, and its test rating is 68 W (maximum) and 1550 ± 15% lumens at 13.2 V. R37 also contains provisions for 6 V, 55 W and 24 V, 70 W H1 lamps. [1]