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Lumen per Square Metre | Lumen per Square Metre | ||
The SI | The SI unit of illuminance. The illuminance produced by a luminous flux of one lumen uniformly distributed over a surface of area one square metre. | ||
Symbol: lx, lm/m2 1 lx = 1 lm/m2 | Symbol: lx, lm/m2 1 lx = 1 lm/m2 | ||
Other metric | Other metric unit: phot (ph) | ||
Non-metric units footcandle (fc) | Non-metric units footcandle (fc) | ||
Latest revision as of 08:03, 17 September 2026
Lumen per Square Metre
The SI unit of illuminance. The illuminance produced by a luminous flux of one lumen uniformly distributed over a surface of area one square metre.
Symbol: lx, lm/m2 1 lx = 1 lm/m2
Other metric unit: phot (ph)
Non-metric units footcandle (fc)
sea-mile candela (s.m.c.)
1 fc = 1 lumen per square foot (lm/ft2)
1 s.m.c. = 1 lumen per square sea-mile
1 lx = 10-4 phot = footcandle
= 3.43 x 106 sea-mile candela
C.I.E.(modified)
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)
