What is the unit of measure of the luminous flux in the SI system?

Lux

Lumen

Candela

Illuminance

The lumen (symbol: lm) is the SI derived unit of luminous flux, a measure of the total quantity of visible light emitted by a source

Blondinrikard Fröberg wikipedia → Lumen (unit)

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Answers by country

Australia

58%

41%

Republic of Ireland

54%

45%

Poland

22%

51%

20%

3187

the Philippines

50%

41%

the United States

17%

48%

28%

Germany

29%

46%

15%

289

the Netherlands

46%

53%

Canada

27%

45%

27%

Switzerland

41%

13%

the United Kingdom

20%

40%

30%

Austria

32%

34%

28%

India

11%

25%

53%

226

Ghana

25%

50%

Greece

50%

16%

22%

11%

Pakistan

28%

35%

28%

Nigeria

92%

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