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  2. NEMA wattage label - Wikipedia

    en.wikipedia.org/wiki/NEMA_wattage_label

    "43" LED sticker—43 watts—Very common "46" LED sticker—46 watts—Very common; A label with a PS before the MH (e.g. 17 PSMH) on a MH sticker indicates that the fixture utilizes the newer pulse start technology, which uses different lamps than the older probe start technology. [1] [2] New Nema LED Sticker Uses For Led Street Light

  3. Luminous efficacy - Wikipedia

    en.wikipedia.org/wiki/Luminous_efficacy

    The former sense is sometimes called luminous efficacy of radiation, [4] and the latter luminous efficacy of a light source [5] or overall luminous efficacy. [ 6 ] [ 7 ] Not all wavelengths of light are equally visible, or equally effective at stimulating human vision, due to the spectral sensitivity of the human eye ; radiation in the infrared ...

  4. LED lamp - Wikipedia

    en.wikipedia.org/wiki/LED_lamp

    A 230-volt LED filament lamp, with an E27 base. The filaments are visible as the eight yellow vertical lines. An assortment of LED lamps commercially available in 2010: floodlight fixtures (left), reading light (center), household lamps (center right and bottom), and low-power accent light (right) applications An 80W Chips on board (COB) LED module from an industrial light luminaire, thermally ...

  5. Standard illuminant - Wikipedia

    en.wikipedia.org/wiki/Standard_illuminant

    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 phosphor-converted blue LED-B3 0.3756: 0.3723 4103 phosphor-converted blue LED-B4 0.3422: 0.3502 5109 phosphor-converted ...

  6. Lumen maintenance - Wikipedia

    en.wikipedia.org/wiki/Lumen_maintenance

    Lumen maintenance is the most useful gauge to determine the lifetime or useful light output rating of an LED light source.Unlike traditional light sources such as incandescent lamps, LEDs rarely fail outright and instead continue to emit light, albeit at slowly diminishing rate over time. [1]

  7. Lumen (unit) - Wikipedia

    en.wikipedia.org/wiki/Lumen_(unit)

    In equation form, 1 lx = 1 lm/m 2. A source radiating a power of one watt of light in the color for which the eye is most efficient (a wavelength of 555 nm, in the green region of the optical spectrum) has luminous flux of 683 lumens. So a lumen represents at least 1/683 watts of visible light power, depending on the spectral distribution.

  8. LED circuit - Wikipedia

    en.wikipedia.org/wiki/LED_circuit

    In CC drivers, the voltage changes while the current stays the same. CC drivers are used when the electrical load of the LED circuit is either unknown or fluctuates, for example, a lighting circuit where a variable number of LED lamp fixtures may be installed. As an LED heats up, its voltage drop decreases (band gap decrease [1]). This can ...

  9. 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.

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