A lumen (abbreviated as lm) is a unit that measures the visible power output of a light. While watts measure the power the bulb needs, lumens measure the visible light that the bulb generates.Get Free Video Surveillance Systems Quotes!
Lux is actually used more often than lumens when discussing security cameras. A lux is a unit of illumination. It measures the amount of uniform light that falls on one square meter (expressed in one lumen per square meter).
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