C405.2 — Lighting Controls
Occupancy sensors required in all enclosed spaces ≤300 ft² and in spaces listed in Section C405.2.1. Occupancy sensor must auto-shut off within 30 min.
C405.2.3 — Daylight Zones
Spaces with sidelit daylight zones >150 ft² or under skylights: multilevel lighting controls with ≥50 % reduction step. Continuous dimming preferred.
C405.2.4 — Automatic Shut-Off
Whole-building automatic shut-off required. Time-of-day scheduling or occupancy sensing. Manual override ≤2 hrs.
C405.3 — Interior LPD
Must comply with ASHRAE 90.1-2019 (or local equivalent) space-by-space or building-area method. No separate IECC LPD tables.
C405.4 — Exterior Lighting
Exterior lights must be controlled by photosensor (on at night, off at dawn) and must reduce by ≥30 % during non-operational hours.
C405.6 — Electrical Metering
Commercial buildings >25,000 ft² must have energy monitoring capable of reporting lighting energy use separately from other end uses.
| Item | Section | Requirement | Status |
|---|---|---|---|
| Interior LPD compliant | C405.3 | Each space ≤ ASHRAE 90.1 LPD limit | ☐ |
| Occupancy sensors in enclosed spaces ≤300 ft² | C405.2.1 | Auto-off ≤30 min | ☐ |
| Daylighting controls in qualified zones | C405.2.3 | ≥50 % reduction step | ☐ |
| Automatic shut-off controls building-wide | C405.2.4 | Schedule or sensor; override ≤2 hrs | ☐ |
| Exterior photosensor controls | C405.4 | On at dusk, off at dawn | ☐ |
| Exterior reduction at non-operational hours | C405.4 | ≥30 % reduction | ☐ |
| Exterior LPD within allowance | C405.5 | Per Table C405.5(1) | ☐ |
| Exit signs ≤5 W per face | C405.2 | LED exit signs recommended | ☐ |
| Electrical energy monitoring (>25,000 ft²) | C405.6 | Separate lighting submeter | ☐ |
| Commissioning documentation | C408.3 | Controls tested and documented | ☐ |
R404.1 — High-Efficacy Lamps
A minimum of 90 % of permanently installed lighting in dwelling units must be high-efficacy (LED ≥45 lm/W or CFL equivalent).
Garage Luminaires
At least one high-efficacy luminaire required in attached garages.
Exterior Luminaires
Exterior attached to the building envelope must be high-efficacy and must have automatic shut-off via photosensor or motion sensor.
Exceptions
Low-voltage lighting systems (12 V) and luminaires in conditioned crawlspaces are exempt from the high-efficacy requirement.
| High-Efficacy Minimum | Threshold |
|---|---|
| LED lamps / luminaires | ≥ 45 lm/W |
| CFL lamps | ENERGY STAR certified |
| Screw-base LEDs | Listed as high-efficacy |
| Integrated LED luminaires | ≥ 45 lm/W overall |
| Application | Allowance |
|---|---|
| Uncovered parking areas | 0.10 W/ft² |
| Covered parking (open) | 0.13 W/ft² |
| Building grounds — walkways | 0.70 W/linear ft (< 10 ft wide) |
| Building grounds — plazas | 0.20 W/ft² |
| Building façades (illuminated) | 0.20 W/ft² |
| Canopies / overhangs | 1.25 W/ft² of canopy |
| Drive-through windows | 440 W per window |
| Main entry doors | 30 W per linear ft of door width |
| Secondary entry doors | 20 W per linear ft of door width |
| Loading areas / docks | 0.10 W/ft² |
| Document | Publisher | Description |
|---|---|---|
| 2021 International Energy Conservation Code | ICC | Primary standard; Chapters C4 and R4. |
| ASHRAE 90.1-2019 (referenced by 2021 IECC) | ASHRAE | LPD tables adopted by reference. |
| ICC Commentaries — IECC Commercial | ICC | Interpretive guidance on C405 provisions. |