Metal halide lamp
Reiling, Gilbert H. Formerly, Lighting Research and Technical Services Operation, General Electric Company, Cleveland, Ohio.
El-Hawary, Mohamed Faculty of Engineering, Dalhousie University, Halifax, Nova Scotia, Canada.
- Principle of operation
- Spectra and applications
- Related Primary Literature
- Additional Reading
A high-pressure discharge lamp that is enclosed in a quartz envelope containing metal halides, usually iodides, and that produces high-efficacy white light. A blend of sodium and scandium iodides is widely used in the United States and Japan, whereas mixtures of indium (blue), thallium (green), and sodium iodides are popular in Europe. Mixtures including rare-earth iodides (such as dysprosium, holmium, and thulium) are also used. The lamps are widely used to light sports stadiums, roadways, commercial interiors, and for industrial applications. The singular lamp feature is the compact geometry and high efficacy of nearly white light. See also: Luminous efficacy
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