Luminous flux
According to BRE’s The essential guide to retail lighting:
The term 'luminous flux' describes the ‘amount of light produced by a lamp; usually measured in lumens’.
Lumen are related to lux (lx), the SI unit of illuminance, or amount of light on a surface, in that one lux is equal to one lumen per square metre (lm/sq. m)
[edit] Related articles on Designing Buildings Wiki
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