Lumen per watt
lm/Wcx:lm_W · Luminous efficacy
1 lm/W = (1 lm)^1 × (1 W)^-1.
- Quantity kind
- Luminous efficacy
- SI dimension
L^-2 · M^-1 · T^3 · Jv- Allowed roles
- Scalar
- Unit system / convention
- Coherent SI
- Registry code
lm_W
Scope and distinctions
Photometric luminous efficacy. Watt-to-lumen conversion requires an efficacy or spectral/photometric model; this unit does not imply a universal factor.
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 4–7: coherent derived units, unit algebra and decimal 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
ba03f52fb5f24b7413396de4d8f32e263dde4a7cce0597b7ff99ac96deb5640d- Definition dependency digest
3bbe93ec084587e7d44dbf556eae3c11879fd994285d44f5dc1ab98711955191
Digests identify definition content; they are not CVP evidence or production attestations.