Lumen

Lumen can mean:

Lumen (unit), the SI unit of luminous flux
Lumen (anatomy), the cavity or channel within a tubular structure
Thylakoid lumen, the inner membrane space of the chloroplast
Phenobarbital (trade name)
141 Lumen, an asteroid discovered by the French astronomer Paul Henry in 1875
Lumen (band), Russian alternative rock band
Lumen Pierce, a fictional character played by Julia Stiles from the television series Dexter
Lumen (branding agency), a design and branding company headquartered in Milan, Italy

See also