Commercial Lighting and Title 24
Indoor lighting is the discipline that decides most commercial compliance outcomes. Installed power is capped per function area, controls are mandatory, and both are documented and tested.
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How the power allowance is set
The Area Category Method assigns a lighting power density to each primary function area in a building — office, lobby, corridor, sales floor, warehouse and so on — and the design has to sit inside the total those areas permit. It is usable for any permit situation, including tenant improvements, which is why it is the method most commercial projects are assessed on.
Additional allowances exist for particular tasks, and Power Adjustment Factors can credit specific measures: daylight dimming with an off state, occupant sensors in small offices, institutional tuning, and demand response among them. Those are earned by installing and documenting the measure, not assumed.
The alteration routes for a relight
Section 141.0(b)2I applies when an alteration includes 10 percent or more of the luminaires serving an enclosed space. It then offers three routes: full compliance with the Section 140.6 power allowance, a design that does not exceed 80 percent of that allowance, or a narrower path for straightforward fitting replacement. That one-for-one route is available only within a building or tenant space of 5,000 square feet or less, and only when the total wattage of the altered luminaires is at least 40 percent lower than before.
The route also sets the controls. Under Table 141.0-F, multilevel, daylight responsive and demand responsive controls apply only on the full compliance route, and the 80 percent and one-for-one routes use a lighter control set. Knowing which route fits before a retrofit is scoped is the difference between a light-touch submittal and a full lighting compliance exercise.
Controls are not optional
Nonresidential indoor lighting requires automatic shutoff control, and the control scheme forms part of what is documented rather than being an installation detail. Lighting controls are also one of the two disciplines that require acceptance testing, performed by a technician certified specifically for lighting controls.
Topics in this section
- Does replacing commercial lighting trigger Title 24?
- What is a Title 24 lighting power allowance?
- What are Title 24 lighting controls?
- Title 24 for warehouse and high-bay lighting
- Title 24 for outdoor and site lighting
- When are automatic daylighting controls required?
- Does Title 24 require skylights in large spaces?
- Title 24 parking garage lighting requirements
- Title 24 sign lighting requirements
- Outdoor lighting zones explained
- What a Title 24 lighting control device must do
Explore Commercial Lighting
- Does Replacing Commercial Lighting Trigger Title 24?
- What a Title 24 Lighting Control Device Must Do
- What Are Title 24 Lighting Controls?
- When Are Automatic Daylighting Controls Required?
- Does Title 24 Require Skylights in Large Spaces?
View all Commercial Lighting guides → · Commercial Title 24 · Title 24 guide