How to Install LED Lighting for 24/7 Operations

Table of Contents

• Why 24/7 Facilities Need a Different Installation Approach
• Step 1: Run an LED Lighting Energy Audit Before Ordering Fixtures
• Step 2: Calculate Fixture Quantity, Spacing and Light Levels
  • Start with target illuminance, not fixture count
  • Work backward from room dimensions and mounting height
  • Spacing follows mounting height and beam pattern
  • Check uniformity, not just average brightness
  • Account for heat and HVAC interaction
• Step 3: Build a Commercial Lighting Installation Schedule That Protects Operations
• Step 4: Select Drivers, Surge Protection and Occupancy Sensors for Continuous Duty
• Step 5: Commission the System With a Verification Checklist
  • Pre-functional checks before energizing
  • Functional and acceptance testing
  • Post-installation monitoring
• Booking Your Free Property Assessment Before the Next Shift Change
• Frequently Asked Questions

Why 24/7 Facilities Need a Different Installation Approach

Last Updated: November 9, 2026

Running LED lighting in a facility that never closes is not the same job as lighting an office that empties at 5 p.m.

Because the lights burn for every hour of every day, small gains in efficiency compound fast. A fixture that draws less power and lasts longer cuts both energy use and the labor needed to replace bulbs.

That is why the approach changes. Here are five steps to plan and install LED lighting when the building never sleeps.

Step 1: Run an LED Lighting Energy Audit Before Ordering Fixtures

Start with a lighting energy audit. You need to know what you have before you buy anything.

Record each fixture type, wattage, count, mounting height and operating hours. Note which areas run around the clock and which only run during shifts. Then look at the controls.

Watch out: ordering fixtures from a rough count instead of a survey often leads to the wrong quantities and wasted budget.

Bring utility bills into the audit too. For more on how to measure this, see our commercial lighting energy audit resources.

Step 2: Calculate Fixture Quantity, Spacing and Light Levels

Once the audit is done, you can size the new system. Lighting design is about getting the right light level where people work, not just adding more fixtures.

Start with target illuminance, not fixture count

Work from the recommended illuminance for each task area, expressed in footcandles (fc) or lux. The Illuminating Engineering Society (IES) publishes recommended maintained illuminance ranges in its IES Lighting Handbook and in ANSI/IES RP-1 for industrial spaces; most designers treat those ranges as the design target rather than a single number. A common pattern in continuously operated warehouses is roughly 10-30 fc for general aisles and storage, higher levels at picking faces and inspection stations, and brighter task lighting at packing and shipping desks.

Work backward from room dimensions and mounting height

To estimate fixture quantity, you need four inputs: room length and width, mounting height above the work plane, the target illuminance, and the lumen output of the fixture you are considering. A simplified lumen method calculation looks like this:

1. Calculate the room area in square feet.
2. Multiply area by target footcandles to get total lumens needed at the work plane.
3. Divide by the fixture’s delivered lumens (not the raw LED lumen rating, use the luminaire’s published delivered lumens).
4. Apply a maintenance factor, typically around 0.7-0.8 for a dirty industrial environment, to account for lumen depreciation and dirt on the lens.
5. Apply a coefficient of utilization that reflects room reflectance and mounting height; higher mounting heights and darker surfaces reduce utilization.

A worked example: a 40,000-square-foot warehouse bay with a 30-foot mounting height, a target of 20 fc, and fixtures delivering 20,000 lumens each. Total lumens needed is 40,000 × 20 = 800,000. Dividing by 20,000 gives 40 fixtures before adjustments. Applying a 0.75 maintenance factor and a 0.8 coefficient of utilization pushes the count toward roughly 65-70 fixtures. That is the kind of gap between a rough count and a designed layout that shows up as dark aisles or wasted budget.

Spacing follows mounting height and beam pattern

Spacing is not a fixed number. In high-bay spaces, a common rule of thumb is that spacing-to-mounting-height ratio should stay near 1:1 to 1.5:1 for narrow-beam high-bays, and wider for fixtures with broader distribution. A fixture hung 30 feet up spreads light differently than one at 15 feet, so spacing has to change with height. Check the fixture’s photometric file (IES LM-79 and LM-80 data, plus the luminaire’s IES file) rather than relying on a catalog average.

Check uniformity, not just average brightness

Average footcandles can look fine while the floor has dark pockets. Uniformity is usually expressed as max-to-min or average-to-min ratios; a common target in industrial aisles is average-to-min of 4:1 or better. Dark spots near racking or along aisle edges create safety risks, especially for forklift traffic. Ask for a point-by-point layout from the fixture manufacturer or a lighting designer, and review it against the actual rack layout, not a generic grid.

Account for heat and HVAC interaction

LED fixtures shed heat through their housings, and heat gain in a sealed building affects HVAC load. In a climate-controlled space, factor the fixture’s wattage and driver losses into the cooling load calculation.

Watch out: approving a layout from a fixture count alone, without a point-by-point photometric plan and a maintenance factor, is the most common reason a new installation measures below target on day one.

Step 3: Build a Commercial Lighting Installation Schedule That Protects Operations

Continuous facilities cannot simply shut down for an install. The schedule has to fit around production, shipping and staffing.

Break the work into zones. Install in small sections so most of the building stays lit and productive.

Plan the schedule around safety coordination. Lifts, lockout procedures and clear aisles all need to be set before crews arrive.

For a full checklist covering scope, phasing and acceptance, see our commercial lighting installation scope of work.

Step 4: Select Drivers, Surge Protection and Occupancy Sensors for Continuous Duty

Components matter more in 24/7 settings. A driver that is fine for a few hours a day may fail early when it runs nonstop. Look for drivers rated for continuous operation at your expected ambient temperature.

Surge protection is worth the cost in facilities with heavy motor loads. Voltage spikes from large equipment can shorten driver life.

Occupancy sensors can still save energy in 24/7 buildings. Many areas, such as storage aisles or back corridors, sit empty for long stretches. Sensors can dim or switch lights in those zones while keeping safe minimum levels. Set minimum light levels for safety before you configure any sensor, so no area drops below what workers need.

Pick sensors and controls that work with your building’s existing systems, and document the settings.

The article’s key component considerations for continuous operation are summarised below.

Step 5: Commission the System With a Verification Checklist

Commissioning is where you confirm the installation works as designed. In a 24/7 facility, the commissioning window is often a single night shift, so the procedure has to be written before crews arrive.

Pre-functional checks before energizing

Before any circuit is energized, verify the physical installation against the design:

• Fixture count and model match the approved layout and photometric plan
• Mounting heights and orientations match the design (a fixture rotated 90 degrees changes the light distribution)
• Branch circuit loading is within the panel schedule and the conductors are sized per the National Electrical Code (NFPA 70)
• Grounding and bonding are complete at every fixture and junction box
• Drivers, surge protective devices, and dimming controls are installed per manufacturer instructions
• Emergency lighting and exit sign circuits are on their required circuits and transfer correctly

Emergency lighting deserves its own check. Under NFPA 101 (Life Safety Code) and NFPA 70, emergency illumination must be provided on circuits that stay energized or transfer to an emergency source, and it must be tested and documented. Confirm the transfer test and the 90-minute duration test are scheduled and recorded.

Functional and acceptance testing

Once energized, run a structured acceptance test:

1. Illuminance measurement. Use a calibrated light meter at the work plane (typically 30 inches for seated tasks, floor level for aisles) at a documented grid of points. Compare against the design targets and record the readings.
2. Uniformity check. Calculate average-to-minimum ratios in aisles and work areas and compare to the design target.
3. Flicker check. Look for visible flicker, especially on dimmed circuits and near cameras or inspection equipment; flicker can affect both worker comfort and machine vision.
4. Controls test. Verify occupancy sensors, daylight sensors, and dimming scenes respond as configured, and confirm minimum light levels are enforced so no area drops below what workers need.
5. Power draw. Record actual kW at the panel and compare against the pre-install baseline from Step 1.
6. Surge protection verification. Confirm the surge protective device is installed, indicating, and correctly grounded.

Record every reading in writing and have the facility’s representative sign off on the acceptance sheet. That document is what proves the project met its targets and is what a utility rebate program will typically ask for.

Post-installation monitoring

Commissioning is a snapshot; monitoring is how you catch drift. Set up a simple ongoing check:

• Re-measure illuminance at a sample of points at 6 and 12 months to catch lumen depreciation or dirt buildup.
• Track fixture failures by zone so a pattern (a bad batch of drivers, a hot ceiling area) shows up early.
• Compare monthly energy use against the baseline to confirm savings persist after controls are tuned.
• Re-check emergency lighting on the schedule required by NFPA 101 and keep the test log.

Watch out: treating the punch list as the commissioning report, signing off on fixture count and a few light-meter readings without recording uniformity, power draw, and emergency transfer results, leaves no defensible record when a zone underperforms or an inspector asks for documentation.

Booking Your Free Property Assessment Before the Next Shift Change

If you run a facility that cannot go dark, the planning details matter. NexVolt Energy Group offers a free property assessment to review your lighting, controls and installation options.

If you want to see what that looks like for a large New Jersey facility, request a commercial LED lighting assessment and share your site details. Or, for a quick start, choose an HVAC, refrigeration or LED lighting assessment for your property.

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