Q：What is Lumen, Candela (Candlepower) and Lux?
Lumen
Lumen (Lm) is the unit of the total amount of visible light (luminous flux) emitted by a light source.
Candela or Candlepower (Cd) is the unit of luminous intensity in a given direction.
Lux is the unit of illuminance which is a measure of how much luminous flux is spread over a given area. The value decreases as the distance from the light source increases.
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