Why a lamp change can trigger controls
The energy code counts luminaires before it looks at the lamp. Under the 2025 Energy Code, an indoor lighting alteration that includes 10 percent or more of the luminaires serving an enclosed space meets the lighting power allowance and the controls in Table 141.0-F. Below that share the alteration is outside the requirement, which is why the first number a retrofit needs is a luminaire count per space rather than a total for the building.
There is a second route for a small space. A one-for-one luminaire alteration in an enclosed space of 5,000 square feet or less complies where the total wattage of the altered luminaires is at least 40 percent lower than what came out. That makes the lamp technology and the count the same decision, because the saving has to be in the fittings rather than in the schedule.
Two exceptions keep most small work outside the trigger. An alteration limited to adding lighting controls or to replacing lamps, ballasts or drivers is excepted, so relamping a floor is a different event from replacing its fittings. So is a one-for-one luminaire alteration of up to 50 luminaires, either per complete floor of the building or per complete tenant space, per annum. In a warehouse with several hundred high bays that annual cap is what decides whether the job is one phase or three.
Outside, the trigger is the same share and the height matters. Where 10 percent or more of the existing outdoor luminaires are replaced without increasing the connected load, parking lot luminaires mounted 24 feet or less above the ground comply with the outdoor controls the code names. Work at that height is reached from non-conductive ladders where the ladder or user may contact unprotected energized conductors.
What commercial lighting retrofits includes
Each enclosed space is counted on its own: how many luminaires serve it, how many are being altered, and what share that is. The count decides which route the job takes, and it is done before any product is chosen.
Lighting power and controls, or the one-for-one route with its wattage cut, or one of the exceptions. Where a permit applies, the application date fixes the code edition.
What is coming out is measured and listed before it goes, because the one-for-one route is proved by the difference between two wattage totals.
Fittings are changed space by space with the circuits isolated, the ceiling or pole made good, and the exit and egress fittings on the same circuits identified and kept live.
Where the trigger is met, the controls the table requires go in with the fittings rather than after them.
One schedule per space: what came out, what went in, the wattage of each, the controls fitted and the permit final where the work needed one.
The share is counted per enclosed space, so a building-wide percentage proves nothing. Ten percent of one office's luminaires can bring controls into that office while a larger job across three floors stays under the line in each.
Where lighting retrofits are scoped
Offices and medical suites
Open floors and small enclosed rooms counted separately, where the 10 percent share is reached in one room long before it is reached on the floor.
Tilt-up warehouses and industrial
High bays in the hundreds, where the 50-luminaire annual exception per floor or per tenant space sets the shape of the programme.
Retail and restaurant units
Display, back-of-house and sign lighting altered at every fit-out, where the count that matters is the one for the enclosed space being worked.
Parking lots and yards
Pole and wall luminaires, where replacing 10 percent or more without increasing load brings the outdoor controls in at 24 feet or less.
HOA common areas
Corridors, car ports, walkways and clubhouse lighting, where the board approves a programme and the annual cap decides how much falls in one year.
Apartment common areas
Stairwells, landings, laundry rooms and car ports, counted space by space and altered around the people using them, with the exit fittings kept live throughout.
Questions about commercial lighting retrofits
When the alteration includes 10 percent or more of the luminaires serving an enclosed space. At or over that share the work meets the lighting power allowance and the controls in Table 141.0-F, unless it qualifies for the one-for-one route in a space of 5,000 square feet or less with total wattage at least 40 percent lower.
An alteration limited to adding lighting controls or to replacing lamps, ballasts or drivers is excepted from the requirement. Changing the fittings themselves is a different event, and that is where the count of luminaires and the enclosed space it serves start to matter on the estimate.
A one-for-one luminaire alteration of up to 50 luminaires, either per complete floor of the building or per complete tenant space, per annum, is excepted. Past that number the alteration is assessed on the 10 percent share, which is why a large retrofit is usually planned in phases.
Where 10 percent or more of the existing outdoor luminaires are replaced without increasing the connected load, parking lot luminaires mounted 24 feet or less above the ground comply with the outdoor lighting controls the code names for that height.
The count per space and the route it puts the job on, whether controls come with the change, how the fittings are reached, and whether the work is phased to stay inside the annual exception.
Commercial lighting retrofits by city
Retrofits are requested through the plumbing, electrical and HVAC page for your city, which sets out the commercial stock served there.
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