Commercial Lighting Repair, Re-lamping and LED Retrofit

If it fails: the first hour

What the site contact should do before the technician arrives.

Identify whether the outage affects a single fixture, a circuit, or the full property
Rope off or otherwise mark dark parking areas that present a safety hazard until service arrives
Check the breaker or panel feeding the affected lighting circuit if safely accessible
Call the provider with the location and extent of the outage

What fails

Ballast and driver failureFluorescent ballasts and LED drivers wear out and fail, causing flickering, humming, or complete fixture failure even when the lamp itself is still good.

Lamp burnout and end-of-life dimmingFluorescent and HID lamps reach end of life gradually, dimming or flickering before full failure, while LEDs typically fail more abruptly at the driver.

Photocell and timer control failureA failed photocell causes exterior lighting to stay on during the day or fail to come on at night, and a failed timer can leave interior lighting running outside business hours.

Parking lot pole light circuit faultsUnderground wiring to pole lights corrodes or shorts at handhole connections, causing individual poles or entire circuits to go dark.

Occupancy and daylight sensor malfunctionSensors that control lighting based on occupancy or daylight can fail to trigger or get miscalibrated, leaving areas dark or lights running when not needed.

Fixture housing and lens degradationExterior fixture housings and lenses crack or seal-fail from UV exposure and weather, letting moisture in that corrodes internal components.

Emergency and exit lighting circuit failureEmergency lighting fixtures fail independently of general lighting circuits and are often only discovered during a code inspection or an actual outage.

What a service call includes

Diagnostic testing to distinguish a lamp failure from a ballast, driver, or circuit issue
Re-lamping and ballast or driver replacement as needed
Photocell and timer testing and calibration
Checking and repairing parking lot pole light wiring and handhole connections
Occupancy and daylight sensor testing and recalibration
Fixture housing and lens inspection, sealing or replacement where weather damage is found
Written report noting fixtures serviced and any circuit-level issues found affecting multiple fixtures

Preventive checklist

The items a maintenance program should carry for this system. Build a combined checklist across systems with the checklist builder.

Spring

Test photocells for proper day and night switching
Inspect exterior fixture housings for winter weather damage

Fall

Check parking lot lighting circuits before shorter daylight hours increase reliance on them
Inspect emergency and exit lighting ahead of winter storm season

Quarterly

Walk the property noting any dark or flickering fixtures for the service list
Test a sample of occupancy sensors for proper function

Annual

Full property lighting audit identifying fixtures nearing end of life
Photometric check of parking lot and exterior lighting levels against code or insurance requirements
Evaluation of remaining fluorescent or HID fixtures for LED retrofit opportunity

What it costs

item	typical range	what moves it
Standard fixture repair or re-lamp	$75 to $250 per fixture	Interior fixture at normal ceiling height
Ballast or driver replacement	$100 to $350 per fixture	Component cost and fixture accessibility
Parking lot pole light repair	$300 to $1,200 per pole	Whether the issue is at the fixture or requires underground wiring repair, lift rental adds cost
Photocell or timer replacement	$100 to $300	Standard component swap
LED retrofit, per fixture	$100 to $400 per fixture	Fixture type and whether a full fixture swap or a retrofit kit is used

National ranges. Local labor, access, after-hours timing and materials move them. Multi-site programs usually price below one-off calls.

When this is an emergency

A complete loss of lighting in an occupied space or parking area that creates a safety hazard, or emergency lighting failing a code-required test.

How to choose a provider

Ask whether the provider carries lift equipment for parking lot pole lights and high-bay interior fixtures
Confirm they can evaluate and quote an LED retrofit, not just replace like-for-like fluorescent or HID components
Ask about response time for a safety-related outage such as a dark parking lot
Check whether they test emergency and exit lighting as part of routine service calls
Ask for an example of a photometric lighting audit if a full property assessment is being considered

Questions

Is it worth retrofitting fluorescent fixtures to LED?

In most cases yes, LED fixtures use significantly less energy, last far longer than fluorescent lamps, and eliminate ballast failures entirely, which reduces both energy cost and service call frequency over time.

Why do several lights go out at once in the same area?

This usually points to a shared circuit or ballast issue rather than several fixtures coincidentally failing at the same time, and it is worth having a technician check the circuit rather than replacing lamps one at a time.

How often should emergency lighting be tested?

Monthly brief function tests and an annual timed duration test are standard practice, and many jurisdictions require documentation of both.

What causes a parking lot light to stay on during the day?

A failed or miscalibrated photocell is the most common cause, and it is a straightforward component replacement once identified.