Lumen
Pronunciation: /ˈluːmən/
Lumen (noun)
- A unit that measures how much visible light a lamp or bulb produces.
- The hollow inside space of a tube or blood vessel where fluid flows.
- A bright opening or space, especially in a dark area, seen as a small area of light.
Examples
- The lamp gives a high lumen output.
- I checked the lumen rating before buying.