Lighting Power Density
Target watts from area and occupancy class using public engineering benchmarks.
Example
You enter
- Area (ft²) 1000
- Occupancy class office
You get
- Target lighting power 1000 W
- Benchmark 1 W/ft^2
Details, formula, and sources
Total lighting power = area × W/ft² benchmark; benchmarks compared to NEC 220.12 unit loads and IECC C405 / ASHRAE 90.1 LPDs.
NEC 2023 (NFPA 70). Section 220.12; IECC 2021 Table C405; ASHRAE 90.1-2022 by name.
Free read-only access at nfpa.org/freeaccess. IECC free read-only at codes.iccsafe.org. ASHRAE 90.1 read-only at ashrae.org.
Estimate. AHJ and licensed electrician govern. Verify against the NEC edition adopted in your jurisdiction.
Field names used by the API: area_ft2, occupancy_class, target_W, w_per_ft2
- Benchmark vintage IECC 2021 / ASHRAE 90.1-2022 LPDsdata/electrical/lighting-density.json