Lighting & Controls
Lighting Energy Code Compliance
Lighting power density, mandatory controls and the documentation your inspector will actually ask for.
Lighting is where commercial energy code compliance is most often lost, and the correction is expensive because it arrives after installation. The requirements are knowable in advance — they are simply frequently not checked until the inspector is standing in the building.
What applies in Colorado
Colorado has adopted the 2021 IECC as its statewide baseline for commercial buildings, with ASHRAE 90.1-2022 underpinning the commercial provisions. Local jurisdictions can and do amend, so the governing requirement is always the adopting jurisdiction rather than the model code in isolation.
The 2021 edition both reduced lighting power allowances and expanded mandatory controls relative to 2018. Warehouse lighting power density, for example, came down to 0.45 W/ft² from 0.48 W/ft². Those margins are tight enough that a fixture substitution made for availability reasons can put a compliant design out of compliance.
The two compliance paths
The prescriptive path requires meeting the lighting power density tables directly and satisfying every applicable control requirement. It is simpler to document and less flexible.
The performance path uses energy modelling — COMcheck being the common tool — and allows trade-offs between systems. It suits projects where the lighting design has a reason to exceed prescriptive allowances and can compensate elsewhere.
Either way, the mandatory control provisions apply. The performance path does not exempt you from them, which is a misunderstanding we see regularly.
Mandatory control provisions
These apply on both compliance paths:
- Automatic shutoff of interior lighting
- Occupancy sensing in the space types the code specifies
- Daylight-responsive control in primary and secondary daylight zones
- Separate control of general, display and task lighting
- Exterior lighting control by photosensor and astronomical time switch
- Parking garage lighting control
- Corridor lighting control
- Plug load control in specified space types
Why lighting fails inspection
In our experience the causes are consistent, and all of them are avoidable at design stage: daylight zones never defined so the required controls were never installed; a fixture substitution that pushed the design over the power allowance with nobody rerunning the calculation; controls installed but not commissioned, so the required sequences cannot be demonstrated; and COMcheck documentation that does not match what was actually built.
We run the compliance calculation before rough-in and rerun it after any substitution. It takes very little time compared with correcting a failed inspection in a finished ceiling.
Common questions
Does energy code apply to a retrofit?
Usually yes, though scope varies by jurisdiction and by how extensive the work is. Alterations generally trigger requirements for the altered portion. Some jurisdictions have specific lighting alteration thresholds. We confirm with the authority having jurisdiction before design rather than assuming.
What is COMcheck?
A free US Department of Energy compliance tool that generates the documentation showing a building meets energy code. Most Colorado jurisdictions accept COMcheck reports as compliance documentation for the lighting portion of a permit.
Can you handle compliance documentation?
Yes. We prepare the lighting power calculations and control compliance documentation, and we handle correction notices ourselves rather than passing them back to you.
Ready to talk about your project?
Tell us what you need and we will give you a straight answer on scope, schedule and cost. No obligation, and no pressure if it turns out we are not the right fit.