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Brightness, the subjective perception elicited by the luminance of a source; Luminance, the photometric equivalent of radiance (lm·sr −1 ·m −2) Photometry (optics), measurement of light, in terms of its perceived brightness to the human eye; Radiometry, measurement of light, in absolute power units; Luminosity
Example: A surface with a luminance of say 100 cd/m 2 (= 100 nits, typical PC monitor) will, if it is a perfect Lambert emitter, have a luminous emittance of 100π lm/m 2. If its area is 0.1 m 2 (~19" monitor) then the total light emitted, or luminous flux, would thus be 31.4 lm.
The sun has a luminance of about 1.6 × 10 9 cd/m 2 at noon. [3] Luminance is invariant in geometric optics. [4] This means that for an ideal optical system, the luminance at the output is the same as the input luminance. For real, passive optical systems, the output luminance is at most equal to the input.
One unfortunate side effect of living in the digital age is that even the iPhone camera is sharp enough to show skin flaws you'd rather keep secret. An HD world requires HD makeup, but you don't ...
The Solawave Radiant Renewal wand, on the other hand, is a 4-in-1 device that employs multiple skincare technologies at once: red LED light therapy to "rejuvenate skin from within," galvanic ...
In radiometry, radiance is the radiant flux emitted, reflected, transmitted or received by a given surface, per unit solid angle per unit projected area. Radiance is used to characterize diffuse emission and reflection of electromagnetic radiation , and to quantify emission of neutrinos and other particles.
Fights acne: This is probably one of salicylic acid’s most well-known benefits. More specifically, it’s a star ingredient for treating comedonal acne like whiteheads and blackheads, which are ...
The word was proposed to prevent confusion between luma as implemented in video engineering and relative luminance as used in color science (i.e. as defined by CIE). Relative luminance is formed as a weighted sum of linear RGB components, not gamma-compressed ones. Even so, luma is sometimes erroneously called luminance. [2]