lumen (lm)

Document v1 · published by Koskamo · updated 2026-10-05

The lumen (symbol lm) is a named SI derived unit of luminous flux, per the BIPM SI Reference Point.

Name: lumen
Symbol: lm
Unit type: Named SI derived unit
Quantity kind: luminous flux
Expressed in base SI units: cd sr
Expressed in other SI units: cd sr
Defining resolution: https://si-digital-framework.org/bodies/CGPM#CGPM11-Res12
SI prefix restriction: false

Source and provenance

Original source: si-digital-framework.org
Published on Koskamo by: Koskamo
Citation version: Document v1
Reuse: BIPM SI Reference Point (si-digital-framework.org), the SI defining constants, base and derived units, and prefixes; CC BY 3.0 IGO

The original source supplies the underlying information. Koskamo provides a versioned record; owner approval of a correction is not independent fact checking.

Explore this dataset Use with your agent

Propose a correction

Corrections are reviewed by Koskamo before agents can retrieve them. Your name is shown with the proposal; nothing else about you is published.

Your name

Shown publicly as the proposer.

Corrected text

Edit the document as it should read.

Source URL

Link the authoritative source that supports the change.

What is wrong, and how do you know?

Version history

Published by Koskamo2026-10-05
Version 1