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2. Sodium-vapor lamp - Wikipedia

   en.wikipedia.org/wiki/Sodium-vapor_lamp

   A high-pressure sodium street light in Toronto A high-pressure sodium-vapor lamp An HPS lamp that isn't entirely off. 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.

3. NEMA wattage label - Wikipedia

   en.wikipedia.org/wiki/NEMA_wattage_label

   Additionally, various colors are used to identify what type of lamp the fixture uses. A yellow sticker indicates the lamp is a sodium vapor lamp (HPS/LPS). A blue sticker indicates the lamp is mercury vapor (MV). A red sticker indicates the lamp is metal halide (MH). A sticker that is half-red and half-white indicates a pulse start metal halide ...

4. Gas-discharge lamp - Wikipedia

   en.wikipedia.org/wiki/Gas-discharge_lamp

   High-pressure lamps have a discharge that takes place in gas under slightly less to greater than atmospheric pressure. For example, a high pressure sodium lamp has an arc tube under 100 to 200 torr pressure, about 14% to 28% of atmospheric pressure; some automotive HID headlamps have up to 50 bar or fifty times atmospheric pressure.

5. Low-pressure sodium lamp - Wikipedia

   en.wikipedia.org/?title=Low-pressure_sodium_lamp&...

   Download QR code; Print/export Download as PDF; Printable version; From Wikipedia, the free encyclopedia. Redirect page. Redirect to: Sodium-vapor lamp#Low-pressure ...

6. Low pressure sodium lamp - Wikipedia

   en.wikipedia.org/?title=Low_pressure_sodium_lamp&...

   move to sidebar hide. From Wikipedia, the free encyclopedia

7. Safelight - Wikipedia

   en.wikipedia.org/wiki/Safelight

   Low-pressure sodium vapour lamps sometimes are used in larger industrial darkrooms. They emit nearly monochromatic light at 589 nm (yellow), to which the materials are insensitive; as a result they can be extremely bright while still "safe". [citation needed]

8. Low-pressure sodium light - Wikipedia

   en.wikipedia.org/?title=Low-pressure_sodium...

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9. Optical flat - Wikipedia

   en.wikipedia.org/wiki/Optical_flat

   A helium-discharge lamp will produce a line at 587.6 nm (yellow), while a mercury-vapor lamp produces a line at 546.1 (yellowish green). Cadmium vapor produces a line at 643.8 nm (red), but low pressure sodium produces a line at 589.3 nm (yellow). Of all the lights, low pressure sodium is the only one that produces a single line, requiring no ...