The Lumen/Luminous Flux (Lm)

Lumen (or luminous flux) is a measurement of the total light emitted by a light source.  For example, a 100-watt incandescent lamp emits about 1300 lumens. Sometimes also referred to as "brightness" or "light output."

NOTE:  Many LEDs focus their light output to a specific beam angle (rather than 360 degrees), often times making it difficult to strictly compare the lumen specs of LED lighting to traditional incandescent and fluorescent lighting (which emit light in 360 degrees).

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