Relationship of Photometric Units

luminous flux (power)

lumens
-> luminous intensity (candlepower)

lumen/sr = candela
-> luminance (photometric brightness)

cd/ft2 (fL) or cd/m2 (nit)
-> illuminance (luminous flux density)

lumen/ft2 (footcandle) or lumen/m2 (lux)

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