What measurement units are used in describing light output?
The most common metric is luminance intensity which is measured in candelas (cd). Luminous intensity tells us how much light flux emitting from the LED is contained in a unit solid angle. Luminance or stearance is sometimes used and is measured in terms of luminous intensity per light emitting area. By using luminance, light measurement becomes independent of light emitting area. Luminance is useful when contrast and visibility need to be considered.
