Apron Floodlighting Design Lux Levels, Pole Layout & Foundations
Understand apron illuminance and uniformity criteria, LED floodlight selection, pole layout and mounting height, glare control, photometric calculation, foundations, electrical coordination and maintenance for airport aprons.
Airport Apron Floodlighting Design
Airport apron floodlighting provides illumination for aircraft parking stands, aircraft servicing, passenger boarding and disembarkation, baggage handling, cargo operations, refuelling and other authorized apron activities.
A well-designed apron lighting system must provide sufficient and reasonably uniform illumination while controlling glare, unwanted shadows, spill light and interference with airport operations.
The design requires more than selecting high-wattage LED floodlights. It involves establishing the required illuminance, evaluating horizontal and vertical lighting performance, selecting suitable luminaires, determining mast locations and heights, completing photometric calculations, coordinating foundations and electrical infrastructure, and verifying the installed system.
Topics covered
What Is an Airport Apron Floodlighting System?
An airport apron floodlighting system illuminates the areas where aircraft are parked, serviced and prepared for departure or arrival.
Unlike runway and taxiway lighting, which uses purpose-designed visual aids to guide aircraft movement, apron floodlighting generally illuminates larger work areas from elevated luminaires mounted on poles, masts or suitable structures.
Main Components of an Apron Lighting System
| Component | Function |
|---|---|
| LED floodlights | Provide the required illumination and beam distribution |
| Lighting poles or masts | Position luminaires at calculated heights and locations |
| Foundations | Transfer structural loads safely into the ground |
| Mounting brackets and aiming arrangements | Support the luminaires and allow the specified aiming configuration |
| Electrical distribution | Supplies and protects the lighting circuits |
| Cables and connections | Provide electrical connections between the distribution equipment and luminaires |
| Earthing and bonding | Provide the specified electrical safety and fault-protection arrangements |
| Lighting controls | Provide the intended switching, scheduling, dimming or monitoring functions where specified |
| Photometric design software | Models illumination, uniformity and relevant lighting performance |
| Inspection and maintenance records | Support condition monitoring and verification throughout the equipment's service life |
Apron Lighting Lux Levels and Uniformity
Illuminance is the amount of luminous flux incident on a surface per unit area. It is measured in lux (lx).
Apron lighting design should establish the required illuminance for each area, the measurement plane, the uniformity criteria and any additional visual-performance requirements.
2.1 Reference Lux Levels for Aircraft Stands
ICAO's aerodrome design guidance and the corresponding provisions in EASA's published aerodrome certification specifications give the following reference criteria for apron floodlighting. Indian Standard IS 11116:1984 also contains similar apron-lighting criteria. Their application must be checked against the governing project requirements.
| Apron area / measurement | Reference illuminance | Uniformity or other criterion |
|---|---|---|
| Aircraft stand — horizontal illuminance | 20 lux average | Average-to-minimum ratio not greater than 4:1 |
| Aircraft stand — vertical illuminance | 20 lux at 2 m above the apron in relevant directions | Assess in the directions relevant to the aircraft stand and servicing activity |
| Other apron areas | Horizontal illuminance equal to 50% of the average horizontal illuminance on aircraft stands | Average-to-minimum ratio not greater than 4:1 |
| Service equipment, parking areas and service roads near the apron limit | 10 lux average horizontal illuminance is specified in IS 11116:1984 | Verify the applicability of this provision to the project |
These are reference criteria, not universal values for every apron activity. Security needs, specialist servicing tasks, project specifications and other operational requirements may require different or additional provisions.
2.2 Horizontal Illuminance
Horizontal illuminance is measured on a horizontal reference plane, typically the apron surface. It helps assess illumination across aircraft parking positions, service areas and other working surfaces.
The photometric model should identify the calculation grid and the surface area over which the illuminance statistics are evaluated. The grid must represent the actual apron geometry rather than omit poorly illuminated areas.
2.3 Vertical Illuminance
Vertical illuminance is measured on a vertical plane and is important where personnel need to identify aircraft sides, markings, service connections and other relevant features.
For aircraft stands, the cited reference criteria include vertical illuminance at a height of 2 m above the apron in relevant directions. The designer must establish the appropriate measurement directions for the actual stand and intended servicing activities.
Horizontal illuminance alone is therefore not a complete measure of apron lighting performance.
2.4 Illuminance Uniformity
Uniformity describes how consistently light is distributed across the assessment area. A common average-to-minimum ratio is:
Eavg is the average illuminance. Emin is the minimum illuminance within the defined calculation area. U0 is the average-to-minimum ratio. For the cited aircraft-stand reference criterion, the ratio should not exceed 4:1.
For example, if the average horizontal illuminance is 24 lux and the minimum is 8 lux:
The ratio is 3:1. Whether the design is acceptable depends on all applicable criteria, not uniformity alone.
Key point: A high average lux value does not guarantee good lighting. A design may achieve a high average while leaving particular areas too dark or creating excessive brightness in others.
Related Guides
AGL photometryWhy the same light gives a quarter of the lux at twice the distance.
AGL Visual Encyclopedia: Illuminance Luminous Flux Light Distribution
What Determines the Required Apron Lux Level?
The required lighting level depends on the intended use of the area and the governing project requirements. Consider the following during the design review:
Different tasks do not necessarily need the same illuminance. A passenger boarding area, an aircraft servicing position and a peripheral service road may have different design criteria.
LED Floodlights for Airport Aprons
LED floodlights are widely considered for apron lighting projects because suitable products can provide efficient light output, controlled beam distributions and flexible switching or dimming options where supported by the equipment. However, suitability must be demonstrated against the project's photometric, electrical, environmental and operational requirements.
Key LED Floodlight Selection Parameters
| Parameter | Why it matters |
|---|---|
| Luminous flux | Indicates the total quantity of light emitted |
| Luminaire efficacy | Indicates how efficiently electrical power is converted into luminous output |
| Photometric distribution | Determines where the light is directed and how it is distributed |
| IES / LDT photometric file | Provides the luminaire intensity data used in a photometric calculation |
| Correlated colour temperature | Describes the apparent colour tone of the white light |
| Colour rendering properties | Help determine how accurately relevant object colours can be identified |
| Glare performance | Supports evaluation of potentially distracting light at relevant viewing positions |
| Ingress protection | Identifies the specified protection against ingress of solids and water |
| Corrosion resistance | Supports equipment suitability for the site's environmental conditions |
| Thermal management | Influences temperature-related performance and equipment life |
| Driver performance | Affects electrical compatibility, operation, control and maintenance |
| Surge protection | Must suit the project's electrical protection requirements |
| Control compatibility | Determines whether the luminaire supports the specified switching, dimming or monitoring functions |
| Maintenance access | Affects inspection, cleaning, replacement and servicing requirements |
| Warranty and support | Influences the lifecycle cost and availability of replacement equipment |
Why Wattage Is Not Enough
Two floodlights with the same rated electrical power can have different luminous output and different beam distributions. One may concentrate more light in a particular direction, while another distributes light over a wider area. The resulting illumination across the apron will therefore differ.
Floodlight selection should use verified photometric data, mounting geometry and calculation results rather than wattage alone.
Colour Identification
Apron lighting should provide light in which the colours used for aircraft markings, routine servicing and relevant surface and obstacle markings can be correctly identified. This requirement appears in the cited aerodrome guidance.
When comparing luminaires, evaluate the documented colour-rendering performance and other relevant characteristics against the project requirements. Do not assume that two luminaires with similar colour temperature will provide identical colour rendering.
Related Guides
AGL comparison libraryApron Floodlighting Pole Layout
Pole layout determines the coverage, uniformity, glare characteristics and maintainability of the lighting system. A suitable design must consider the apron geometry, aircraft parking arrangement, surrounding infrastructure and intended maintenance strategy.
5.1 Factors Affecting Pole Location
| Design factor | Key consideration |
|---|---|
| Aircraft stand geometry | Ensure the required areas are illuminated without creating excessive dark zones |
| Aircraft dimensions and parking orientation | Account for large aircraft surfaces, stand clearances and potential shadows |
| Apron dimensions | Determine the required coverage and feasible mounting positions |
| Passenger boarding bridges | Consider obstruction, glare and access limitations |
| Terminal buildings | Avoid unwanted spill light and conflicts with building interfaces |
| Control tower sight lines | Avoid glare and obstructions affecting controllers |
| Taxiways and aircraft movement areas | Minimise distraction and operational interference |
| Service roads and pedestrian routes | Provide the required coverage in designated movement and work areas |
| Maintenance access | Allow safe access for cleaning, aiming checks and replacement |
| Existing utilities | Coordinate pole locations with buried and above-ground services |
| Obstacle clearance requirements | Assess mast height and location under applicable aerodrome safeguarding criteria |
| Structural and civil constraints | Confirm the feasibility of foundations, cable routes and installation access |
5.2 Mounting Height
Mounting height affects the illuminated area, beam spread, uniformity, glare and the physical feasibility of the installation.
The ICAO Aerodrome Design Manual, Doc 9157 Part 4, discusses mounting floodlights at sufficient height to reduce direct and indirect glare, including guidance related to the maximum eye height of pilots of aircraft regularly using the airport. The manual also emphasizes the need to consider mast location, height and the operational environment.
5.3 Lighting from Multiple Directions
Floodlights should be arranged and aimed so that each aircraft stand receives light from two or more directions where required by the applicable design criteria. This helps reduce shadows and improves visibility across aircraft surfaces and the working area.
Where practical, favour a coordinated distribution across the stand and apron over a layout that directs individual intense beams at isolated points.
5.4 Pole Spacing
Pole spacing should be determined from the photometric calculations and actual site geometry. There is no universal spacing that applies to every apron. The result depends on:
Related Guides
Apron lighting & stand guidance (VDGS)Floodlight masts between stands, with overlapping coverage and stand guidance.
AGL Visual Encyclopedia: Apron Lighting Layout Aircraft Stand Lighting Interface VDGS Interface with Stand and Apron Systems
Glare Control and Light Spill
Glare can interfere with the visibility of pilots, air traffic controllers, apron controllers and ground personnel. Unwanted light can also affect surrounding areas and create visual distraction.
Glare control should therefore be treated as a design requirement, not as an adjustment to be addressed only after installation.
ICAO apron floodlighting guidance calls for adequate illumination with minimum glare and recommends restricting direct light toward the control tower and landing aircraft. It also highlights suitable aiming and the control of light above the horizontal plane.
Glare-Control Measures
Glare and spill are controlled by where the beam points, not by lux alone.
AGL Visual Encyclopedia: Edge-Light Beam Light Distribution
Apron Floodlighting Photometric Calculation
A photometric calculation estimates how light from the proposed luminaires will be distributed over the selected areas. The calculation should use verified luminaire photometric data and the proposed installation geometry. It should represent the relevant obstructions, calculation surfaces and acceptance criteria.
7.1 Required Design Inputs
Before starting the calculation, collect:
Apron geometry
Overall dimensions, aircraft stand boundaries, stand centre lines, service areas and adjacent movement areas.
Pole layout
Proposed coordinates, mounting heights, bracket details and luminaire orientation.
Luminaire data
Manufacturer, model, rated power, verified luminous output and IES/LDT photometric file.
Aiming parameters
Luminaire tilt, rotation and other orientation details required by the modelling software.
Obstructions
Terminal buildings, passenger boarding bridges, hangars, other structures and relevant site features.
Calculation criteria
Required horizontal and vertical illuminance, uniformity and any project-specific glare or spill-light criteria.
Surface assumptions
The specified calculation plane and any reflectance or environmental assumptions needed for the study.
7.2 Photometric Calculation Workflow
Step 1: Define the calculation area.
Separate aircraft stands, service areas, apron roads and other relevant zones.
Step 2: Establish the grid.
Select appropriate grid spacing and measurement planes in accordance with the applicable calculation method and project requirements.
Step 3: Import photometric data.
Use the correct data for the exact luminaire model and optical configuration proposed.
Step 4: Place the luminaires.
Enter actual or proposed pole locations, heights and mounting orientations.
Step 5: Set the aiming angles.
Use the planned installation configuration and evaluate glare-sensitive directions.
Step 6: Run the calculations.
Determine average, minimum and relevant maximum illuminance, uniformity and the other required outputs.
Step 7: Review isolux plots and results.
Identify dark areas, excessive concentrations, uneven coverage and potential spill-light concerns.
Step 8: Refine the layout.
Adjust pole positions, mounting height, optics or aiming when justified, then recalculate.
Step 9: Verify the design basis.
Confirm that the results meet the specified criteria and that the model corresponds to the proposed installation.
Step 10: Issue the design records.
Retain the calculation report, luminaire data, layout, assumptions and revision information.
7.3 What Should a Photometric Report Include?
A professional apron floodlighting calculation report should generally identify:
Related Guides
AGL photometryNested isocandela contours show where a luminaire sends its light.
AGL Visual Encyclopedia: Light Distribution Isocandela Diagram Measurement Points
Lighting Calculation Versus On-Site Lux Measurement
A photometric calculation is a prediction based on the model inputs and assumptions. An on-site illuminance survey measures the installed system under the conditions at the time of the survey. Both can be important for design verification and acceptance.
Comparison of Calculation and Measurement
| Aspect | Photometric calculation | On-site lux survey |
|---|---|---|
| Purpose | Predict performance before installation or modification | Measure actual illuminance after installation or during assessment |
| Main inputs | Photometric files, layout, mounting geometry and calculation criteria | Installed lighting, measuring points, operating conditions and measurement method |
| Common output | Predicted average, minimum and uniformity values, plus plots | Recorded illuminance measurements and calculated statistics |
| Main limitation | Results depend on input-data accuracy and model assumptions | Results depend on the actual installation and survey method |
| Typical use | Design development and comparison of layout alternatives | Verification, acceptance assessment and maintenance investigations |
On-Site Survey Considerations
For accurate comparison, the calculation and survey should use compatible areas, measurement planes and acceptance definitions.
A calculation predicts, a survey confirms, and the gap between them needs an explanation.
AGL Visual Encyclopedia: Light-Intensity Measurement Measurement Points
Apron Lighting Pole Foundations and Structural Coordination
Floodlighting poles and masts are structural installations. Their foundations should be designed by appropriately qualified personnel using the actual site data and applicable structural requirements. The foundation design cannot be finalized solely from the pole height or luminaire wattage.
Main Foundation Design Inputs
| Input | Why it matters |
|---|---|
| Pole or mast data | Establishes the geometry, mass and manufacturer-specified support requirements |
| Luminaire arrangement | Influences the wind-exposed area and applied loads |
| Wind design conditions | Determines relevant structural loading under applicable requirements |
| Soil investigation | Provides information about bearing, settlement and other geotechnical conditions |
| Foundation geometry | Determines how loads are transferred into the ground |
| Anchor bolts and base plate | Must match the approved structural and manufacturer details |
| Corrosion and environment | Influences material selection and durability provisions |
| Underground services | Affects foundation position and excavation planning |
| Cable entries and ducts | Requires coordination with the structural and electrical drawings |
| Drainage and surface levels | Helps prevent unsuitable water accumulation around the foundation |
| Maintenance access | Supports inspection, replacement and servicing arrangements |
| Airport safeguarding | Ensures the pole location and height meet applicable aerodrome requirements |
Pole Foundation Coordination Checklist
Foundation block, anchor bolts and the conduit rising to the equipment.
AGL Visual Encyclopedia: Foundations Fixture Foundations
Electrical Distribution, Protection and Controls
The electrical infrastructure should support the intended lighting arrangement and allow safe operation, inspection and maintenance.
Electrical Design Considerations
The final design should be prepared and reviewed under the applicable electrical and airport engineering procedures.
Lighting Control Strategy
Depending on the project, controls may provide:
The control strategy should be based on the intended operation and the selected equipment's verified capabilities.
Emergency and Operational Lighting Considerations
Apron lighting supports night-time work and passenger activities. The design should consider the implications of an electrical supply failure or loss of a lighting circuit. The requirement for emergency or contingency illumination depends on the airport's operational requirements, safety assessment and project specification.
Where additional provision is required, evaluate:
Related Guides
Emergency power & lighting systemsWhat takes over when normal control or supply is lost, and how recovery is verified.
AGL Visual Encyclopedia: Emergency Control Standby power and UPS
Apron Floodlighting Maintenance
A properly designed system still requires inspection and maintenance to preserve its intended performance. Maintenance planning should cover luminaires, poles, foundations, electrical equipment, controls and the condition of relevant installation records.
Routine Maintenance Checklist
Inspection intervals should be established through the applicable maintenance programme, manufacturer recommendations, environmental conditions and observed equipment performance.
When Is a Lux Survey Needed?
A lux survey may be appropriate during initial acceptance, following significant alterations, after relevant aiming changes, when persistent dark areas are reported or when required by the inspection programme.
The survey should follow the specified measurement method and use the applicable acceptance criteria. Results should be traceable to the equipment condition and assessment area at the time of measurement.
From requirement list to plan, safe work, verification and records.
AGL Visual Encyclopedia: Maintenance Requirement Flow Corrective Maintenance Sequence Fixture Alignment (Maintenance)
Common Mistakes in Apron Floodlighting Design
Selecting luminaires by wattage alone
Why it matters
- Wattage does not establish the resulting illumination, uniformity or glare performance.
Designing only for horizontal illuminance
Why it matters
- Some apron activities and reference criteria require assessment of vertical illuminance as well.
Checking average lux without uniformity
Why it matters
- An acceptable average can conceal poorly illuminated areas.
Using unverified photometric files
Why it matters
- The calculation should represent the exact luminaire model and optical configuration proposed.
Placing poles before reviewing site constraints
Why it matters
- Buildings, aircraft stands, service routes, utilities and control tower sight lines may affect suitable locations.
Ignoring glare
Why it matters
- Excessive direct light toward pilots, controllers or personnel can undermine the usability of the lighting system.
Directing each floodlight at individual aircraft
Why it matters
- The overall distribution should be assessed so the stand receives balanced illumination from appropriate directions.
Using a generic pole height or spacing
Why it matters
- Both depend on the layout, photometric performance, constraints and structural design.
Ignoring foundations and cable coordination
Why it matters
- Foundation conflicts or inadequate access can lead to redesign and installation delays.
Replacing a luminaire without checking its photometric data
Why it matters
- An alternative fixture may produce a different distribution and change the calculated or measured performance.
Treating a calculation as proof of installed performance
Why it matters
- Where required, the installation must be verified using the specified inspection and measurement methods.
Apron Floodlighting Design Checklist
Use this checklist as an initial design-review aid.
Design Basis
Equipment and Photometry
Civil and Electrical Coordination
Installation and Acceptance
Explore the AGL Engineering Knowledge Hub
Fundamentals
Standards & Compliance
Runway, Taxiway & Approach Lighting
Surface Movement & Safety
PAPI
Electrical Engineering & Power
Photometry & Testing
Maintenance, Inspection & Safety
Resources, Documentation & Careers
Frequently Asked Questions
Q1What lux level is required for airport apron lighting?
A commonly cited reference criterion for an aircraft stand is an average horizontal illuminance of 20 lux, a uniformity ratio not greater than 4:1, and vertical illuminance of 20 lux at 2 m above the apron in relevant directions. Other apron areas may use different criteria. Confirm the applicable standard, airport requirements and project specification before using these values for design.
Q2What is the uniformity ratio for apron floodlighting?
The cited aircraft-stand criterion uses an average-to-minimum illuminance ratio not greater than 4:1. The applicable project criteria determine how the area and measurement grid must be assessed.
Q3Are LED floodlights suitable for airport apron lighting?
They can be suitable when the selected luminaires meet the required photometric, electrical, environmental and operational criteria. Selection should be based on verified photometric data and the completed design calculation, not wattage alone.
Q4How is apron floodlighting pole height determined?
Pole height is determined through the photometric design and the relevant structural, operational and aerodrome constraints. The calculation should assess coverage, uniformity, glare and relevant obstructions; structural design must also account for the actual site and loading conditions.
Q5Why should apron floodlights illuminate aircraft stands from more than one direction?
Lighting from different directions can reduce shadows and improve visibility across aircraft surfaces and service areas. The cited apron floodlighting guidance specifically emphasizes this principle.
Q6What is the difference between horizontal and vertical illuminance?
Horizontal illuminance is measured on a horizontal plane, such as the apron surface. Vertical illuminance is measured on a vertical plane and helps assess illumination of vertical surfaces, such as aircraft sides, in the relevant directions.
Q7Which software is used for apron floodlighting calculations?
Photometric software can model luminaires, pole positions, aiming angles, obstructions and calculation grids. Use software that supports the required calculation method and verified photometric data; the software name alone does not establish design compliance.
Q8Is a lux meter survey necessary after installation?
The need for a survey depends on the approved acceptance procedure, project specification and maintenance requirements. Where measurements are required, follow the prescribed grid and method and compare results with the defined acceptance criteria.
Q9How often should apron floodlights be maintained?
The maintenance interval should follow the airport's approved maintenance programme, manufacturer recommendations, environmental conditions and observed performance. Inspection frequency should not be assumed to be identical for every installation.
Q10What is an apron lighting system?
An apron lighting system is the floodlighting installed on the aircraft apron so ground handling, loading, fuelling and servicing can take place safely at night. It normally comprises floodlights, poles or mounting structures, power distribution, control and protection, and it is separate from the airfield ground lighting on runways and taxiways.
Q11What is an apron lighting pole layout?
An apron lighting pole layout is the arrangement of floodlight poles around or on the apron. Pole position, height and spacing are chosen from the lighting calculation to reach the required illuminance and uniformity while controlling glare and spill. It must also respect obstacle limitation and aircraft clearance.
Q12Why use apron lighting LED floodlights?
Apron lighting LED floodlights offer high efficacy, good control of the light distribution, long service life and instant switching. They suit apron use when selected with the right optics and glare control. The luminaire choice should follow the approved design and lighting calculation.
Q13What does apron lighting maintenance involve?
Apron lighting maintenance includes inspecting lamps or LED modules, cleaning optics, checking pole and fixing condition, testing protection and earthing, verifying aiming and measuring illuminance on site. Work at height and work on live equipment follow the airport's permit and safety procedures.
Q14What are airport apron electrical systems?
Airport apron electrical systems are the supply, distribution, protection, earthing and control arrangements serving apron lighting and related equipment. They include feeder circuits, distribution boards, cables, switching or control, and any emergency or backup supply that the project requires.
Q15How does apron lighting energy efficiency improve?
Apron lighting energy efficiency improves with efficient LED luminaires, good optics that put light only where it is needed, suitable control such as dimming or schedules, and correct maintenance. Efficiency must not reduce the required illuminance, uniformity or glare limits.
Q16What is an apron lighting photometric calculation?
An apron lighting photometric calculation predicts illuminance and uniformity on the apron from the luminaire data, mounting height, aiming and layout. It is checked against the required levels, and on-site lux measurements confirm the installed result.
Q17What are the airport apron lighting requirements?
Airport apron lighting requirements are set by ICAO and national requirements and by the airport's own specification. They address illuminance levels, uniformity, glare control and light spill. Confirm the applicable values and the stand types with the airport operator and the approved design.
Related AGL Resources
Explore these related pages.
AGL Design Engineering
Design calculations, equipment selection and engineering considerations.
Open guideAGL Project Documentation Guide
Drawings, test reports, records and handover documentation.
Open guideFinal Note
A reliable apron floodlighting system requires a complete engineering approach that integrates lux levels, uniformity, glare control, luminaire selection, pole layout, foundation design, electrical distribution, photometric calculations and maintenance.
Use the applicable standards and approved project criteria to establish the design requirements. Validate the proposed layout using verified photometric data, coordinate the civil and electrical works, and complete the required verification after installation.
Technical References
- ICAO Aerodrome Design Manual, Doc 9157, Part 4 — Visual Aids — guidance on apron illuminance, uniformity, glare control and floodlight arrangement.
- EASA Easy Access Rules for Aerodromes — March 2026 revision — apron floodlighting criteria in CS ADR-DSN.M.750.
- Indian Standard IS 11116:1984 — Code of Practice for Lighting for Airport Aprons — Indian apron-lighting design, performance and glare-control guidance. Verify current status and applicability before using it as the governing requirement.
The cited ICAO and EASA materials explain the technical basis for the reference values above. The project specification and applicable airport requirements determine which criteria govern a particular installation.
Engineering & Expert Notes
Calculated Lux Is Not Measured Lux
VerificationVerify design values on site with calibrated instruments, using the same grid assumed in the design.
Glare Control Protects Pilots and Ground Crew
GlareCheck aiming, shielding and mounting height. Glare can compromise safety even when average lux is correct.
Uniformity Matters as Much as Average
UniformityDark patches hide hazards. Review the ratio of minimum to average as well as the mean.
Pole Foundations Need Engineering
StructuresConsider wind loads, soil conditions and access for maintenance equipment.
Plan Electrical Protection and Distribution
ElectricalInclude discrimination, earthing and surge protection in the design package.
Design for Maintenance Access
MaintenanceConsider how luminaires will be replaced and cleaned without disrupting apron operations.
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