Lumen can mean:
- lumen (unit), the SI unit of luminous flux
- 141 Lumen, an asteroid discovered by the French astronomer Paul Henry in 1875
- lumen (anatomy), the cavity or channel within a tubular structure, such as the vascular lumen of a blood vessel or the lumen of a seminiferous tubule
- Thylakoid lumen, the inner membrane space of the chloroplast.
- See also: Lux.
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