The ULC specification.

Schema, taxonomy, authoring patterns, conformance and achievements, and PIM mapping guides for the ULC standard.

To propose a change, file a schema change proposal in the spec repository. To fix a typo, open an issue or pull request against the source on GitHub atgithub.com/ulcspec/ULC.

Reference
Authoring patterns
The four manufacturer publishing shapes (A: per-SKU · B: per-photometric-scenario · C: per-IES with provenance · D: per-foot linear), plus authoring exit-sign and emergency-class records and achievement attestations.
Reference
Schema reference
JSON Schema Draft 2020-12. Every field documented with type, required/optional, allowed values, and example. Served at /schema/ulc.json.
Reference
Taxonomy
Closed enums for luminaire categories, mounting types, optical accessories, attestations, dimming protocols, source-file types, provenance sources, exit-sign and emergency vocabularies, and achievement states.
Reference
Conformance
How the three grades (Core, Standard, Full) above an Incomplete floor are computed, why the cut points mirror a Division 26 specification, and why a fixture is graded only on what its form requires, exit signs and emergency luminaires included.
Reference
Achievements
The second computed view: what the product is documented for, per theme (embodied carbon, circularity, material health, energy, dark sky, emergency, domestic content), each none, claimed, or documented, computed from the record's attestations, with a restricted-substances flag beside it.
PIM mapping
PIM mapping guides
How to add a ULC export path alongside your existing exports for Salsify, Akeneo, SAP, and custom / in-house PIMs.
Crosswalks
Crosswalks
Field-by-field mapping from ULC to GLDF, ETIM, IES LM-63, and EULUMDAT. All four are planned; status is flagged on the index.

Stewarded by Foad Shafighi MIES, IALD, CLD.

Specification on GitHub:github.com/ulcspec/ULC↗Site source:github.com/ulcspec/ulcspec.org↗