The difference between lux and lumen presented by HEINE

>> YOUR LINK HERE: ___ http://youtube.com/watch?v=n4MlvqWY4Ms

A light bulb moment!

Lumen (Unit Of Luminous Flux), Lux (Unit Of Illuminance), Veterinary Medicine (Field Of Study), Medicine (Field Of Study), Light-emitting Diode (Invention)
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