Definition availableExact definition Candidate definition
Lumen
lmcx:lm · Luminous flux
1 lm = (1 cd)^1 × (1 sr)^1.
- Quantity kind
- Luminous flux
- SI dimension
Jv- Allowed roles
- Scalar
- Unit system / convention
- Coherent SI
- Registry code
lm
Scope and distinctions
Luminous flux, distinct from luminous intensity despite the same SI dimension vector.
Available operations
No converter is linked for this definition yet. You can inspect the definition and its sources.
Verification scope
New UUCE conversion paths have not been CVP-verified or production-attested. An exact unit definition is not a verification claim.
Candidate is a registry lifecycle state. It is not a completed review or CVP verification.
Definition sources
- BIPM — The International System of Units (SI)
9th edition, version 4.01, June 2026
Tables 2, 4 and 5: SI units; Table 7: SI prefixes
Source checked:Definition metadata attributed to BIPM; brochure licensed CC BY 4.0.
Definition and registry versions
- Definition revision
- 1.0.0
- Registry snapshot
- 0.3.0-preview.3 · preview
- Definition lifecycle
- candidate
- Definition owner
- core.metrology
- Definition digest
6377cb078924163ce3c7cd24bbf3d64d4c5990124d66872a99631ce6311c9a2c- Definition dependency digest
582a74dcbb692a926595b85f27311b12eeac6184dc162194ec20964ffa7900ee
Digests identify definition content; they are not CVP evidence or production attestations.