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  2. Metal-halide lamp - Wikipedia

    en.wikipedia.org/wiki/Metal-halide_lamp

    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]

  3. NEMA wattage label - Wikipedia

    en.wikipedia.org/wiki/NEMA_wattage_label

    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. Gray indicates that the fixture is of an LED type. In addition to being colour-coded, newer NEMA stickers also state the lamp type abbreviation just below the lamp's wattage (e.g. HPS, LED).

  4. Luminous efficacy - Wikipedia

    en.wikipedia.org/wiki/Luminous_efficacy

    Luminous efficacy of radiation measures the fraction of electromagnetic power which is useful for lighting. It is obtained by dividing the luminous flux by the radiant flux . [ 4 ] Light wavelengths outside the visible spectrum reduce luminous efficacy, because they contribute to the radiant flux, while the luminous flux of such light is zero.

  5. High-intensity discharge lamp - Wikipedia

    en.wikipedia.org/wiki/High-intensity_discharge_lamp

    HID lamps produce different colors of light primarily through the use of various metal additives in the lamp's arc tube and the physics of the gas discharge process. [11] Metal Additives: HID lamps contain an arc tube filled with a mixture of gases, including a noble gas (like xenon). These metal additives are crucial for producing different ...

  6. Hydrargyrum medium-arc iodide lamp - Wikipedia

    en.wikipedia.org/wiki/Hydrargyrum_medium-arc...

    Unlike regular incandescent halogen lamps where a halide gas is used to regenerate the filament and keep the evaporated tungsten from darkening the glass, the mercury vapour and the metal halides in HMI lamps are what emit the light. The high color rendering index (CRI) and color temperature are due to the specific lamp chemistry.

  7. Standard illuminant - Wikipedia

    en.wikipedia.org/wiki/Standard_illuminant

    Standard high pressure sodium lamp HP2 0.4778: 0.4158 2506 Color-enhanced high-pressure sodium lamp HP3 0.4302: 0.4075 3144 High pressure metal halide lamp HP4 0.3812: 0.3797 4002 High pressure metal halide lamp HP5 0.3776: 0.3713 4039 High pressure metal halide lamp LED-B1 0.4560: 0.4078 2733 phosphor-converted blue LED-B2 0.4357: 0.4012 2998