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

the Netherlands

60%

40%

Australia

58%

41%

the United States

15%

53%

25%

104

Poland

22%

51%

20%

3263

Republic of Ireland

50%

the Philippines

50%

41%

Germany

28%

49%

14%

314

Canada

27%

45%

27%

the United Kingdom

19%

44%

28%

Switzerland

40%

43%

13%

Austria

33%

29%

India

11%

25%

53%

226

Ghana

25%

50%

Greece

50%

16%

22%

11%

Pakistan

28%

35%

28%

Nigeria

92%

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