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  2. Luminance - Wikipedia

    en.wikipedia.org/wiki/Luminance

    A luminance meter is a device used in photometry that can measure the luminance in a particular direction and with a particular solid angle. The simplest devices measure the luminance in a single direction while imaging luminance meters measure luminance in a way similar to the way a digital camera records color images.

  3. Orders of magnitude (illuminance) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude...

    As visual perception varies logarithmically, it is helpful to have an appreciation of both illuminance and luminance by orders of magnitude. Illuminance To ...

  4. Brightness - Wikipedia

    en.wikipedia.org/wiki/Brightness

    When appearing on light bulb packages, brightness means luminous flux, while in other contexts it means luminance. [5] Luminous flux is the total amount of light coming from a source, such as a lighting device. Luminance, the original meaning of brightness, is the amount of light per solid angle coming from an area, such as the sky.

  5. Relative luminance - Wikipedia

    en.wikipedia.org/wiki/Relative_luminance

    Relative luminance follows the photometric definition of luminance including spectral weighting for human vision, but while luminance is a measure of light in units such as /, relative luminance values are normalized as 0.0 to 1.0 (or 1 to 100), with 1.0 (or 100) being a theoretical perfect reflector of 100% reference white. [1]

  6. Luminous intensity - Wikipedia

    en.wikipedia.org/wiki/Luminous_intensity

    Light with the same radiant intensity at other wavelengths has a lower luminous intensity. The curve which represents the response of the human eye to light is a defined standard function y (λ) or V (λ) established by the International Commission on Illumination (CIE, for Commission Internationale de l'Éclairage ) and standardized in ...

  7. Illuminance - Wikipedia

    en.wikipedia.org/wiki/Illuminance

    Illuminance diagram with units and terminology. In photometry, illuminance is the total luminous flux incident on a surface, per unit area. [1] It is a measure of how much the incident light illuminates the surface, wavelength-weighted by the luminosity function to correlate with human brightness perception. [2]

  8. Doctors Explain If Red Light Therapy Really Works for ... - AOL

    www.aol.com/lifestyle/doctors-explain-red-light...

    Meaning, it tries to reshape an area of your body vs. helping you to lose significant amounts of weight. There have been a few studies on using red light therapy for weight loss, although they ...

  9. HSL and HSV - Wikipedia

    en.wikipedia.org/wiki/HSL_and_HSV

    Luminance (Y or L v,Ω) The radiance weighted by the effect of each wavelength on a typical human observer, measured in SI units in candela per square meter (cd/m 2). Often the term luminance is used for the relative luminance, Y/Y n, where Y n is the luminance of the reference white point. Luma (Y ′)