Lumen (unit) facts for kids
The lumen (symbol: lm) is the SI derived unit for brightness. It is defined as 1 candela times 1 steradian.
One lumen is about a twelfth the brightness of a candle, so a candle has a brightness of around 12 lumens.
See also
In Spanish: Lumen para niños
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Lumen (unit) Facts for Kids. Kiddle Encyclopedia.