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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. Gardiner Expressway - Wikipedia

   en.wikipedia.org/wiki/Gardiner_Expressway

   In the late 1990s, the low pressure sodium lighting was failing and most of the cobra-neck conventional poles were replaced in favour of shaded high-mast lighting, with high-pressure sodium-vapor lamps (HPS); however the elevated Gardiner still retained the LPS cobra-neck poles for seven more years, while the section immediately west of ...

4. NEMA wattage label - Wikipedia

   en.wikipedia.org/wiki/NEMA_wattage_label

   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 lamp (PSMH). Green is also used on HPS units in Canada.

5. Gas-discharge lamp - Wikipedia

   en.wikipedia.org/wiki/Gas-discharge_lamp

   Compared to other lamp types, relatively high arc power exists for the arc length. Examples of HID lamps include mercury-vapor lamps, metal halide lamps, ceramic discharge metal halide lamps, sodium vapor lamps and xenon arc lamps. HID lamps are typically used when high levels of light and energy efficiency are desired.

6. Penning mixture - Wikipedia

   en.wikipedia.org/wiki/Penning_mixture

   A very common Penning mixture of about 98–99.5% of neon with 0.5–2% argon is used in some neon lamps, especially those rated for 120 volts. The mixture is easier to ionize than either neon or argon alone, and lowers the breakdown voltage at which the tube becomes conductive and starts producing light.

7. High-intensity discharge lamp - Wikipedia

   en.wikipedia.org/wiki/High-intensity_discharge_lamp

   Metal-halide (MH) lamps; Ceramic MH lamps; Sodium-vapor lamps; Xenon short-arc lamps; The light-producing element of these lamp types is a well-stabilized arc discharge contained within a refractory envelope arc tube with wall loading in excess of 3 watts per square centimetre (19 W/in 2). Mercury-vapor lamps were the first commercially ...