FAQ

What is the Luminance Normal to Surface?
Luminance Normal to Surface is defined as a measure of wavelength-weighted power emitted by the light source in a particular direction per unit solid angle. Luminance Normal to Surface is usually measured using the Lux for Illuminance. Note that the value of Luminance Normal to Surface is always positive.
Can the Luminance Normal to Surface be negative?
No, the Luminance Normal to Surface, measured in Illuminance cannot be negative.
What unit is used to measure Luminance Normal to Surface?
Luminance Normal to Surface is usually measured using the Lux[lx] for Illuminance. Candela Steradian per Sq Meter[lx] are the few other units in which Luminance Normal to Surface can be measured.
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