3rd December 2019

wikipedia
18

How many lumens is 1 lux?

One lux is equal to one lumen per square metre: 1 lx = 1 lm/m2 = 1 cd. sr/m2. A flux of 1000 lumens, concentrated into an area of 1 square metre, lights up that square metre with an illuminance of 1000 lux.

What is luminous flux in Lumen?

Luminous flux is the quantity of the energy of the light emitted per second in all directions. The unit of luminous flux is lumen (lm). One lumen is the luminous flux of the uniform point light source that has luminous intensity of 1 candela and is contained in one unit of spatial angle (or 1 steradian).
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