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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. High-intensity discharge lamp - Wikipedia

   en.wikipedia.org/wiki/High-intensity_discharge_lamp

   Diagram of a high-pressure sodium lamp A high-pressure sodium lamp, Philips Master SDW-T 100W. Various types of chemistry are used in the arc tubes of HID lamps, depending on the desired characteristics of light intensity, correlated color temperature, color rendering index (CRI), energy efficiency, and lifespan.

4. Thorn Lighting - Wikipedia

   en.wikipedia.org/wiki/Thorn_Lighting

   Introduced the 70 W high pressure sodium lamp. 1981: Launched two major improvements in fluorescent lighting: an energy saving replacement for the ordinary light bulb (the 2D compact fluorescent lamp) and the high frequency electronic ballast (exhibited at Hannover Messe, Germany). 1984: Developed the Haloheat cooker hob with halogen heat lamps ...

5. 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. Metal ...

6. Light fixture - Wikipedia

   en.wikipedia.org/wiki/Light_fixture

   Fuel lamps; Betty lamp, butter lamp, carbide lamp, gas lighting, kerosene lamp, oil lamp, rush light, torch, candle, Limelight, gas mantle Safety lamps: Davy lamp and Geordie lamp. Gas-discharge lamp and high-intensity discharge lamp (HID) Mercury-vapor lamp, Metal-halide (HMI, HQI, CDM), Sodium vapor or "high-pressure sodium" Neon sign ...

7. High-mast lighting - Wikipedia

   en.wikipedia.org/wiki/High-mast_lighting

   While most high-mast lights are high-pressure sodium, other lamp types such as mercury vapor, metal halide and LED, have also been used. Some units have the lighting surrounded by a circular shield to prevent or reduce light pollution or light trespass from affecting neighborhoods adjacent to the highway.