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  2. Color temperature - Wikipedia

    en.wikipedia.org/wiki/Color_temperature

    CCT dimming for LED technology is regarded as a difficult task, since binning, age and temperature drift effects of LEDs change the actual color value output. Here feedback loop systems are used, for example with color sensors, to actively monitor and control the color output of multiple color mixing LEDs.

  3. Candela per square metre - Wikipedia

    en.wikipedia.org/wiki/Candela_per_square_metre

    The candela per square metre (symbol: cd/m 2) is the unit of luminance in the International System of Units (SI). The unit is based on the candela, the SI unit of luminous intensity, and the square metre, the SI unit of area.

  4. Luminous efficacy - Wikipedia

    en.wikipedia.org/wiki/Luminous_efficacy

    The typical response of human vision to light under daytime or bright conditions, as standardized by the CIE in 1924. The horizontal axis is wavelength in nanometers. [8] 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]

  5. Luminous flux - Wikipedia

    en.wikipedia.org/wiki/Luminous_flux

    The luminous intensity (in candelas) is a measure of how bright the beam in a particular direction is. If a lamp has a 1 lumen bulb and the optics of the lamp are set up to focus the light evenly into a 1 steradian beam, then the beam would have a luminous intensity of 1 candela.

  6. Light-emitting diode - Wikipedia

    en.wikipedia.org/wiki/Light-emitting_diode

    The first LED was created by Soviet inventor Oleg Losev [9] in 1927, but electroluminescence was already known for 20 years, and relied on a diode made of silicon carbide. ...

  7. LED street light - Wikipedia

    en.wikipedia.org/wiki/LED_street_light

    An LED street light or road light is an ... Many people dislike the ambiance produced by LEDs with color temperatures of 4000K or higher. 2700K and 3000K LEDs are ...

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