1. Luminous flux
Light metric derived from the effect of radiation on a standard luminosity observer.
The unit is lumens (lm), 1lm=1cd/1sr. For Ming Vision there are:
In the formula:
dΦe(λ)/dλ--the spectral distribution of the radiant flux;
ν(λ)--spectral light (visual) efficiency;
Km - The maximum value of the spectral (visual) performance of radiation in lumens per watt (lm/W). In the case of monochromatic radiation, the Km value under bright visual conditions is 683 lm/W (when λm = 555 nm).
2, luminous intensity
The luminous intensity of the illuminant in a given direction is the quotient of the luminous flux dΦ transmitted by the illuminant in the solid angle element dΩ in that direction divided by the solid angle element, that is, the luminous flux per unit solid angle.
The unit is Candela (cd), lcd = 1 lm / sr.
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