Sodium-vapor lamp | Wikipedia audio article

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00:00:43 1 Development
00:03:03 2 Low-pressure sodium
00:06:07 2.1 Light pollution considerations
00:07:13 2.2 Film special effects
00:08:23 3 High-pressure sodium
00:10:14 3.1 "White" SON
00:11:00 3.2 Theory of operation
00:13:58 4 End of life
00:16:11 5 ANSI HPS ballast codes
00:16:22 6 See also



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SUMMARY
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A sodium-vapor lamp is a gas-discharge lamp that uses sodium in an excited state to produce light at a characteristic wavelength near 589 nm.
Two varieties of such lamps exist: low pressure and high pressure. Low-pressure sodium lamps are highly efficient electrical light sources, but their yellow light restricts applications to outdoor lighting, such as street lamps. High-pressure sodium lamps emit a broader spectrum of light than the low-pressure lamps, but they still have poorer color rendering than other types of lamps. Low-pressure sodium lamps only give monochromatic yellow light and so inhibit color vision at night.