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By 1917, the number of incandescent filament lamps used in street lighting had reached 1,389,000 across the United States, while the number of arc lamps had started to decline. [ 1 ] In 1919, San Francisco introduced tungsten bulbs on Van Ness Avenue , between Vallejo and Market Street , replacing gas mantles and arc lamps. [ 1 ]
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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]