Lux is lumen per square meter.

According to Wikipedia, "The difference between the lux and the lumen is that the lux takes into account the area over which the luminous flux is spread. 1000 lumens, concentrated into an area of one square meter, lights up that square meter with an illuminance of 1000 lux. The same 1000 lumens, spread out over ten square meters, produces a dimmer illuminance of only 100 lux."

Need return to FAQs category? Please click here LED FAQs or http://www.eosled.com/faqs/