CEFR C1

lumen

noun

Meaning

A unit of luminous flux in the International System of Units (SI), equal to the amount of light emitted from one artificial cubic foot of space in one second from one candle.

Examples

The new LED bulb produces 800 lumens, offering a much brighter light than the old incandescent one.
To determine the best lighting for the room, we need to consider the total lumens required.

Synonyms: brightness, luminance, radiance

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lumen (C1)

noun

Pronunciation: /ˈluːmən/

Definition

A unit of luminous flux in the International System of Units (SI), equal to the amount of light emitted from one artificial cubic foot of space in one second from one candle.

Examples

The new LED bulb produces 800 lumens, offering a much brighter light than the old incandescent one.
To determine the best lighting for the room, we need to consider the total lumens required.
The packaging stated that the lamp had a luminous efficacy of 100 lumens per watt.

How to Use lumen

lumen per watt (collocation): A measure of the efficiency of a light source, indicating how much visible light is produced for each unit of electrical power consumed. — "This new bulb boasts an impressive 150 lumens per watt, making it highly energy-efficient."

Synonyms of lumen

Words with a similar meaning to lumen:

Antonyms of lumen

Words with the opposite meaning to lumen:

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