Last edited 22 Sep 2016

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/m^2)

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