For Halogen we have terms and definitions in 7 topics. The topics are Air Quality, Corrosion, Environment, Explosives, Film, Furniture and Lighting.

A family of chemical elements that includes fluorine, chlorine, bromine, and iodine
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Any of the elements of the halogen family, consisting of fluorine, chlorine, bromine, iodine, and astatine.
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A type of incandescent lamp with higher energy-efficiency that standard ones.
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Any of the five chemical elements in group VIIa of the Periodic Table. Fluorine, Chlorine, Bromine, Iodine, and the radioactive Astatine are nonmetallic, monovalent negative ions and exist in pure form as diatomic molecules. The first four elements exhibit an almost perfect gradation of physical properties. Fluorine is the least dense and chemically the most active, displacing other halogens from their compounds and oxygen from water. Iodine is the least active. The halogens form numerous compounds with each other, and with other elements, such as hydrogen halides, metal halides (Salts), and halocarbons.
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This is the gas contained in the lamp of a Quartz Light, which prolongs the life of the tungsten filament. Quartz Lights are sometimes called Halogen Lights for this reason.
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Incandescent light source which uses compact, highly efficient bulbs. Special fixtures are required for their use.
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An incandescent lamp containing halogen gas which recycles the tungsten.
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