Tungsten lighting is a term used by photographers to distinguish from fluorescent lighting or strobe lighting. Tungsten is a type of incandescent lighting using a bulb with a filament made of the metal tungsten, as opposed to, say, carbon or platinum. Unless you have switched to compact fluorescents, most of the lighting in your home is tungsten. In still photography, tungsten lighting gave studio photographers greater flexibility than the classic north sky light. Tungsten lights reigned supreme for many years in commercial studios until the introduction of strobes (or speed lights) and some workers still prefer tungsten for its controllability (what you see is what you get). For television and cinematography tungsten is essential.
Tungsten lamps specifically for photographic purposes are made to very tight tolerances since most photography or cinematography today is done in color. For photography, tungsten lamps are produced in two types, having very specific "color temperatures:" type B lamps, the most common, have a color temperature of 3200 degrees Kelvin (3200Â°K); type A lamps had a color temperature of 3400Â°K and were matched to Kodachrome Type A (ASA/ISO 40). This material is now discontinued and so far as I know there are no other Type A still stocks on the market.
Without getting too tediously technical we should try briefly to explain "color temperature:" The higher the color temperature, the bluer the light. The lower the color temperature, the more yellow to red the light. Noon daylight (sun shining, no cloud cover) in the area of the globe between the tropics is considered for practical purposes to have a color temperature of 5000 degrees Kelvin (5000Â°K). "Daylight" color films, or your default setting on your digital camera, are balanced for Â±5000Â°K. Electronic flashes ("strobes" or "speed lights" or the little strobe on your camera) have a nominal color temperature equal to noon daylight. All other light sources have different color temperatures and theoretically require some sort of compensation to render "true" color, either by filtering the film or the light or by changing the film or settings on the camera. If you are using studio quality tungsten lighting, you should also use a type-B incandescent balanced film, or set your digital camera for either AUTO or incandescent. In practice, plain household tungsten lighting (color temperature around 2800Â°K) will yield a perfectly acceptable photograph with a type-B film or with your digital camera set on auto or incandescent.
Most 3200Â°K studio lamps used today are tungsten halogen. Halogen lamps have quartz envelopes and are filled with a halogen gas such as iodine or bromine. The gas combines with the evaporated tungsten from the filament during use and helps some of the tungsten plate back onto the filament when it cools, lengthening the life of the lamp. The quartz envelope does not darken over the life of the lamp, so the color temperature does not significantly change, nor does its brilliance.
Because of its ability to stay solid at high temperatures. However tungsten is hardly used exclusively for lighting purposes. Its presence can be found in really hard metallic alloys, electrons, lubricants and as a cheap gold "substitute" in jewelry due to the similar densities of gold and tungsten.
Tungsten is useful for glass-to-metal seals since the thermal expansion is about the same as borosilicate glass tungsten and its alloys are used extensively for filaments for electric lamps, electron and television tubes, and for metal evaporation work electrical contact points for car distributors X-ray targets windings and heating elements for electrical furnaces missile and high-temperature applications high-speed tool steels and many other alloys contain tungsten the carbide is important to the metal-working, mining, and petroleum industries calcium and magnesium tungstates are widely used in fluorescent lighting tungsten salts are used in the chemical and tanning industries tungsten disulphide is a dry, high-temperature lubricant, stable to 500°C tungsten bronze and other tungsten compounds are used in paints TV tubes (electron tubes) Nozzles for the rockets engines, for example, are made from tungsten steel.
Tungsten is heavy and fragile . Pure tungsten metal should be in dark grey color, tungsten metal usually use in industrial for filament and making steel. Another important part for tungsten is the tungsten carbide, usually use in jewelry. Tungsten carbide jewelry are in bright silver color, it's made from the 85.7 tungsten carbide and together mixed titanium.
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