One of the very reactive elements in column 7 of the periodic table that are only one electron short of a full outer orbital, primarily fluorine, chlorine and bromine
Any compound of chlorine, iodine, bromine, or fluorine, and another element Silver bromide, silver chloride, and silver iodide are the light sensitive materials in silver emulsions
Any of a group of naturally occurring inorganic compounds that contain a halogen such as fluorine, chlorine, iodine, or bromine as the anion. Such compounds, with the notable exceptions of fluorite, halite, and sylvite, are rare and of very local occurrence
A high-pressure discharge lamp that is enclosed in a quartz envelope containing metal halides (usually iodides), and produces high-efficacy white light
A type of light bulb that uses special gases to give off a very bright white light They give off a spectrum of light very similar to sunlight and are highly recommended for reef aquariums Metal Halide bulbs require a special ballast unit for operation
Metal halide lights are a type of light bulb which burns very white and very bright They require a special fixture and ballast They are the closest thing we have to artificial sunlight, and are typically used on reefs and planted tanks They are very efficient in terms of lumens/watt Do not confuse these with halogen bulbs, which have a very yellow light not appropriate for aquarium use
A type of high intensity discharge (HID) lamp in which the major portion of the light is produced by radiation of metal halide and mercury vapor in the arc tube