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💡 Light unit 🩻 Inner space
lumen

lumen

4 7.5
A measure of how much light a lamp or bulb gives
  • noun
  • /ˈluːmən/
  • Specialized
translation icon : lumen
  • The regular bulbs gave 630 lumens; the CFL, 800 lumens.
  • ANSI lumens
  • lumens per watt

Every light will have how many lumens it gives off.

Examples

  • In the Turbo Bright mode, brightness reaches 2100 ANSI lumens, providing audiences a clearer view of the projected image in a well-lit setting.

    Academic text (2001)

  • The typical projector is the Epson Powerlite, which has 1500 lumens and works well with a screen about 7 feet square.

    Academic text (2005)

  • Actually the worst is the installation cost, the lumens per dollar.

  • All right, And it's lux, which is lumens the way you measure the light.

  • "No school should have less than 1,200 lumens," he says.

    Academic text (2007)

  • Anything less than 120 lumens just won't get the job done.

    Blog text (3)

  • Light is not measured in "watts"; it is measured in "lumens."

    Blog text (20)

  • For lightbulbs, the Holy Grail is 10W or so for 800 lumens for $20 in an Edison medium form factor.

    Blog text (6)

  • A bright LED bulb can produce up to 1,200 lumens, making it suitable for well-lit spaces.

  • The flashlight emits a powerful lumen output of 300 lumens, providing excellent visibility in dark areas.

Synonyms

lm
vslumen
  • Specialized
1 9.2

A measure of how much light a bulb or lamp gives

is the full SI unit name rather than the abbreviated form
luminous flux unit
vslumen
  • Specialized
7.9

A unit that measures the visible light a lamp or bulb gives

is the precise SI unit defined for light per steradian from one candela

Surface Forms

lumen singular
lumens plural

Etymology

Lumen comes from Latin lumen meaning 'light'. You can see the same root in luminous and illuminate, so a lumen is a unit that measures how much light a lamp or bulb gives.