Runway Lighting
Runway Edge Light for Airfield Ground Lighting
Precision runway lateral guidance for safe aircraft operations
Runway edge lights provide the visual lateral guidance required to define the usable runway width and assist pilots during take-off, landing and low-visibility operations. Precision AGL Solutions supplies and supports runway edge lighting solutions selected according to the runway category, operating conditions, installation arrangement, optical requirements, series-circuit configuration and project specification. Fixtures may be supplied in elevated or inset/in-pavement configurations, depending on the runway design, pavement arrangement, obstacle-clearance requirements and applicable standards.
Supplied by Precision AGL Solutions
Product Overview
Runway Edge Light
Runway edge lights are installed in two approximately parallel rows along the runway edges to provide a continuous visual definition of the runway lateral limits. ICAO Annex 14 requires runway edge lights on a runway intended for night use and on a precision approach runway for day or night use. They are placed along the edges of the runway area, or outside it by not more than 3 m. Confirm the clause and edition for the project. Depending on the application, the fixture may be configured as:
- Elevated runway edge light
- Base-mounted elevated runway edge light
- Stake-mounted elevated runway edge light
- Inset / in-pavement runway edge light
- Unidirectional configuration
- Bidirectional configuration
- LED light source
- Halogen/incandescent configuration where specified
- Fixed-intensity or multi-intensity configuration
- Series-circuit compatible configuration
For instrument runways, the lighting arrangement and colour configuration are particularly important because runway edge lighting works together with the runway centreline, threshold/end, touchdown-zone and approach lighting systems to provide a coherent visual reference to the flight crew.
The final fixture configuration should always be selected against the approved runway lighting design, photometric requirements, electrical circuit characteristics and project technical specification.
Primary Applications
Where Runway Edge Lights Are Used
01 — Instrument RunwaysContinuous lateral visual guidance along the runway during instrument operations and reduced-visibility conditions.
02 — Precision Approach RunwaysPart of the integrated runway lighting system for precision approach operations, with threshold, centreline and touchdown-zone lighting as applicable.
03 — CAT I / CAT II / CAT IIIFixture type, optical performance, intensity settings and installation configuration set from the applicable runway category and approved lighting design. Spacing follows the instrument / non-instrument runway type.
04 — Non-Instrument RunwaysVisually defines the runway edges and provides lateral guidance for aircraft operations.
05 — Elevated InstallationsWhere an elevated arrangement is specified and adequate clearance from aircraft movement areas can be maintained.
06 — Inset / In-PavementWhere an elevated fixture would create an unacceptable obstruction or the runway design requires a flush pavement installation.
Runway Edge Light Function
What the Fixture Must Do
Primary Functions
- Define the lateral limits of the runway.
- Provide continuous visual runway-edge guidance.
- Assist pilots during take-off and landing.
- Improve runway recognition during reduced visibility.
- Provide visual reference during night operations.
- Support the overall runway lighting pattern.
- Maintain the required colour and photometric characteristics.
- Operate reliably as part of the airport series-circuit lighting system.
A System, Not an Isolated Product
Runway edge lights should not be considered as an isolated lighting product. Their performance depends on the complete AGL system, including the CCR, primary circuit, isolating transformers, connectors, secondary wiring, fixture installation, optical alignment and control system.
Configuration
Elevated and Inset Runway Edge Lights
Elevated Runway Edge Light
Elevated fixtures are installed above the pavement surface using an appropriate mounting arrangement. They provide an easily identifiable visual reference and are commonly used where the runway design permits above-ground fixtures.
Typical configurations
- Stake mounted
- Base mounted
- Frangible support arrangement
- Single fixture
- Bidirectional fixture
- Multi-directional optical arrangement where specified
Elevated lights on the movement area must be frangible and low enough to keep clearance for propellers and engine pods of jet aircraft (ICAO Annex 14). Use the fixture manufacturer's certified frangible coupling and mounting method.
Inset / In-Pavement Runway Edge Light
Inset fixtures are installed flush or substantially flush with the pavement. They are selected where:
- Pavement clearance is critical.
- Elevated fixtures are undesirable.
- The runway design requires in-pavement installation.
- Aircraft wheel clearance must be maintained.
- High mechanical protection is required.
- The approved design specifies an inset fixture.
Installation requires attention to
- Base-can compatibility
- Fixture orientation
- Torque requirements
- Pavement interface
- Drainage
- Cable connection
- Transformer installation
- Water ingress protection
- Optical cleanliness
- Maintenance access
Light Source Options
LED and Halogen / Incandescent
LED
LED technology may be selected where specified by the project. Potential advantages include:
- Long service life
- Lower maintenance requirements
- Consistent optical performance
- Reduced energy consumption
- Rapid switching
- Good compatibility with modern AGL control systems
- Reduced lamp replacement frequency
Actual performance depends on the selected manufacturer's design and approved product specification.
Halogen / Incandescent
Halogen or incandescent configurations may be available where the project specification requires them or where existing infrastructure is being maintained. Selection should consider:
- Lamp rating
- Lamp life
- Optical system
- Current setting
- Replacement requirements
- Existing transformer and circuit compatibility
- Spare-parts availability
Light Colour
Specify the Colour Configuration, Not Just "White"
The runway edge light colour arrangement shall be selected according to the applicable aerodrome standard and runway configuration.
Under ICAO Annex 14, Volume I, runway edge lights are fixed lights showing variable white, except that they show red in the approach direction between the runway start and a displaced threshold, and a section at the remote end of the runway may show yellow, covering 600 m or one-third of the runway length, whichever is less.
FAA practice differs: on instrument runways yellow replaces white on the last 2,000 ft (610 m) or half the runway length, whichever is less. Use the zone length that matches the governing standard for the project.
The product should therefore not simply be specified as "white runway edge light". The required optical and colour configuration should be established from the runway direction, threshold arrangement and approved lighting design.
Technical Data
Typical Light Configuration
| Parameter | Typical Requirement / Selection |
|---|---|
| Product | Runway Edge Light |
| Application | Runway lateral guidance |
| Installation | Elevated / Inset |
| Light source | LED / Halogen as specified |
| Direction | Uni-directional / Bi-directional |
| Main colour | White |
| Special colour sections | Yellow / Red where applicable |
| Circuit | Airport series lighting circuit |
| Control | CCR / ALCMS as applicable |
| Transformer | Individual isolating transformer |
| Connector | Primary & secondary AGL connector system |
| Mounting | Base / stake / in-pavement |
| Optical system | Lens / reflector / LED optical assembly |
| Intensity | Project-specific |
| Beam distribution | Project-specific |
| Environment | Outdoor airport environment |
| Maintenance | Replaceable/maintainable components according to design |
| Documentation | Datasheet, drawings, certificates and test documents as applicable |
Important: Values such as intensity, beam angles, dimensions, power consumption, transformer rating and environmental classification should be entered from the selected manufacturer's approved Technical Data Sheet, rather than using generic catalogue values.
Photometric Performance
Key Selection Criterion
The fixture should be evaluated for each of the following.
Light intensityThe required intensity depends on the runway application and applicable lighting system design.
Beam distributionThe beam must provide the required visual coverage in the intended viewing direction.
ColourThe fixture must produce the required aviation lighting colour within the applicable chromaticity requirements.
Vertical distributionRequired vertical coverage for the intended aircraft viewing geometry.
Horizontal distributionAppropriate lateral coverage while maintaining the required runway-edge visual pattern.
Intensity controlCorrect operation at the intensity steps provided by the airport's AGL control system.
Electrical Characteristics
Series Circuit Arrangement
Runway edge lights in a conventional AGL series circuit are normally supplied through an individual isolating transformer.
CCR → Primary AGL Cable → Primary Connector → Isolating Transformer → Secondary Connector → Runway Edge Light
Constant Current RegulatorProvides controlled constant-current output to the series circuit.
Primary Series CircuitCarries the controlled AGL circuit current around the runway.
L-823 / Primary ConnectionConnects the primary circuit to the isolating transformer.
Isolating TransformerIsolates the series primary circuit from the individual fixture.
Secondary ConnectionConnects the transformer secondary to the light.
Runway Edge LightProduces the optical output for runway lateral guidance.
Coordinate the Electrical Arrangement With
- Constant Current Regulator
- Series circuit current
- Isolating transformer rating
- Primary cable
- Primary connector
- Secondary connector
- Fixture input characteristics
- ALCMS/control system
- Circuit monitoring requirements
Specify as Part of the Circuit
The runway edge light should be specified as part of the complete AGL circuit rather than as an independent electrical load. See isolating transformer, primary connector kit and secondary connector kit.
Construction & Environment
Mechanical Construction and Environmental Requirements
Mechanical Construction
Depending on the selected product, construction may include:
- Aviation-grade aluminium housing
- Stainless-steel hardware
- High-strength optical components
- Sealed optical chamber
- Replaceable lens/optical assembly
- LED module or lamp assembly
- Frangible mounting arrangement
- In-pavement housing
- Cable entry arrangement
- Protective gasket/sealing system
- Corrosion-resistant external finish
The exact construction shall be confirmed from the manufacturer's approved technical documentation.
Environmental Requirements
Runway edge lights operate in demanding outdoor environments and should be selected considering:
- Rain
- Humidity
- Temperature variation
- Dust
- UV exposure
- Aircraft jet blast
- Vibration
- Pavement contamination
- Cleaning chemicals
- De-icing chemicals where applicable
- Water ingress
- Corrosive airport environments
For inset fixtures, give particular attention to water sealing, drainage, gasket condition and pavement interface.
Comparison
Elevated vs Inset Runway Edge Light
| Feature | Elevated | Inset / In-Pavement |
|---|---|---|
| Installation | Above pavement | Flush with pavement |
| Visibility | High fixture visibility | Flush optical presentation |
| Mechanical exposure | Higher | Lower |
| Pavement integration | Simple/standard support | Requires base-can/interface |
| Maintenance access | Generally easier | Requires pavement/base access |
| Aircraft clearance | Must be considered | Excellent flush clearance |
| Typical application | Where elevated fixture permitted | Where flush installation required |
| Installation complexity | Moderate | Higher |
| Drainage consideration | Important | Critical |
| Alignment | Fixture alignment | Precision orientation required |
Installation Considerations
Correct Installation Delivers the Designed Performance
Fixture locationPosition the fixture according to the approved runway lighting layout.
SpacingDetermined by the applicable runway category, lighting design and governing standard.
AlignmentThe fixture must be correctly oriented to its intended optical direction.
ElevationElevated fixtures must be installed at the specified height with appropriate clearance.
Inset orientationInset fixtures must be aligned with the runway axis and specified light distribution.
Base installationBase cans, mounting hardware and drainage arrangements must suit the selected fixture.
Cable connectionPrimary and secondary connections must be correctly installed, sealed and mechanically protected.
ICAO Annex 14 specifies runway-edge-light spacing of not more than 60 m for an instrument runway and 100 m for a non-instrument runway. FAA practice limits spacing of medium- and high-intensity runway edge lights to 200 ft (61 m). All subject to the applicable provisions and project design.
Series Circuit Compatibility
Confirm Before Procurement
Runway edge lights form part of an airport series circuit.
- CCR output current
- Circuit voltage
- Transformer rating
- Fixture electrical input
- Number of fixtures
- Cable length
- Circuit resistance
- Circuit inductance
- Connector system
- Required intensity steps
- ALCMS interface
- Monitoring requirements
This prevents an otherwise suitable fixture from being incorrectly selected for the existing AGL circuit.
Product Selection Matrix
How We Select the Right Fixture
| Selection Parameter | Requirement |
|---|---|
| Runway type | Instrument / Non-instrument |
| Approach category | CAT I / CAT II / CAT III as applicable |
| Installation | Elevated / Inset |
| Circuit | Series circuit |
| CCR current | As project specified |
| Transformer | Matching isolating transformer |
| Direction | Uni / Bi-directional |
| Light colour | White / special configuration |
| Intensity | Project-specific |
| Optical distribution | Project-specific |
| Mounting | Stake / Base / In-pavement |
| Pavement type | Asphalt / Concrete / Project-specific |
| Environmental conditions | Project-specific |
| Control system | Manual / ALCMS |
| Certification | Project / authority requirement |
| Standards | ICAO / FAA / DGCA / project specification |
Technical Submittal
Technical Data to Request from Manufacturer
For every runway edge light quotation, the submittal should preferably include the following.
Optical Data
- Photometric curve
- Horizontal beam distribution
- Vertical beam distribution
- Maximum intensity
- Intensity at required angles
- Colour/chromaticity information
- LED spectral characteristics where applicable
Electrical Data
- Rated current
- Rated voltage
- Power consumption
- CCR compatibility
- Transformer compatibility
- Intensity-step compatibility
- Power factor where relevant
- Electrical protection
Mechanical Data
- Overall dimensions
- Mounting dimensions
- Weight
- Housing material
- Lens material
- Cable entry arrangement
- Base compatibility
- Frangible mounting details
Environmental Data
- Operating temperature
- Storage temperature
- Ingress protection
- Humidity resistance
- Corrosion resistance
- Vibration resistance
- Environmental testing
Documentation
- Product datasheet
- GA drawing
- Installation drawing
- Wiring diagram
- Photometric report
- Type-test documentation
- Compliance certificates
- Installation manual
- Maintenance manual
- Spare-parts list
Inspection & Quality Checks
Before and After Installation
Before Installation
- Verify model and part number.
- Check product condition.
- Verify lens condition.
- Check housing for damage.
- Confirm mounting hardware.
- Verify cable connection.
- Confirm product configuration.
- Review manufacturer documentation.
- Confirm optical configuration.
- Confirm colour configuration.
After Installation
- Verify fixture position.
- Verify orientation.
- Check mounting.
- Check cable termination.
- Verify transformer connection.
- Check insulation/continuity as applicable.
- Energize the circuit under controlled conditions.
- Verify operation at required intensity steps.
- Perform photometric verification where required.
Maintenance Considerations
Routine Maintenance
Visual Inspection
- Broken lens
- Contamination
- Water ingress
- Housing damage
- Loose hardware
- Corrosion
- Misalignment
- Physical impact
Electrical Inspection
- Secondary connections
- Transformer condition
- Connector condition
- Cable insulation
- Circuit continuity
- Abnormal resistance
- CCR response
Photometric Inspection
- Light intensity
- Beam alignment
- Colour
- Uniformity
- Abnormal dimming
- Fixture-to-fixture consistency
A runway edge light should not be considered fully restored merely because the lamp/LED is illuminated. Optical alignment, intensity, colour, electrical connection and physical condition must also be considered.
Common Failure Modes
Failure and Possible Cause
| Failure | Possible Cause |
|---|---|
| Light OFF | Lamp/LED failure |
| Light OFF | Secondary connector failure |
| Light OFF | Isolating transformer failure |
| Light OFF | Primary connector problem |
| Light OFF | Open series circuit |
| Low intensity | Optical contamination |
| Low intensity | LED/lamp degradation |
| Wrong colour | Lens/optical component problem |
| Wrong direction | Incorrect fixture orientation |
| Intermittent operation | Loose connection |
| Water ingress | Seal/gasket failure |
| Repeated failure | Cable/transformer/circuit issue |
| Physical damage | Aircraft/vehicle/FOD impact |
| Uneven lighting | Incorrect installation/alignment |
Troubleshooting Flow
Work Along the Circuit
CCRVerify circuit current
Primary circuitCheck primary circuit
Primary connectorCheck primary connector
Isolating transformerCheck transformer
Secondary connectorCheck secondary connector
Fixture inputCheck fixture input
Lamp / LEDInspect lamp / LED module
OpticsInspect optical system
AlignmentVerify alignment
Restore & testRecord failure and corrective action
This approach helps prevent unnecessary replacement of an apparently faulty runway light when the actual problem is located in the connector, transformer, cable or series circuit.
Safety
Electrical Safety — Isolation and Lock-Out
WARNING — never open a live series circuit. An open series circuit driven by a constant-current regulator can produce dangerously high voltage. Opening, cutting or disconnecting any part of an energised circuit can cause serious injury or death and damage equipment.
- De-energise the circuit at the regulator and apply the site lock-out / tag-out (LOTO) procedure before any work
- Where the circuit must be isolated or shorted, use the series circuit cut-out switch or approved isolation device — not an improvised bypass
- Verify the circuit is de-energised and the output is isolated before touching conductors, connectors, splices, transformers or fixtures
- Do not disconnect or reconnect a fixture's secondary connector while the series circuit is energised: an open secondary on a series isolating transformer can develop hazardous voltage and damage the transformer
- Work on the movement area only under the airport's permit-to-work system, with the runway or taxiway closed as required, using qualified personnel and the manufacturer's instructions
- Follow the applicable national electrical safety regulations and site procedures
Standards & References
Governing Standards
Selection and installation should be based on the applicable project edition of the governing aviation standards, approved drawings and airport authority requirements.
ICAO
Annex 14 — Aerodromes, Volume I — Aerodrome Design and Operations. Relevant provisions cover location, spacing, colour, light characteristics and runway edge definition. Runway edge lights are arranged in two parallel rows along the runway. Colours are specified in Annex 14 Appendix 1 and light characteristics (intensity and beam distribution) in Appendix 2. See also the Aerodrome Design Manual (Doc 9157) Part 4 (Visual Aids) and Part 5 (Electrical Systems).
See the ICAO Annex 14 Guide.
FAA
AC 150/5345-46F — Specification for Runway, Taxiway, Heliport, and Vertiport Light Fixtures; listed as active and issued September 30, 2024.
AC 150/5340-30J provides design and installation details for airport visual aids and identifies elevated runway edge-light classifications including L-861 (medium intensity) and L-862 (high intensity, typically precision runways). Inset runway edge lights are L-850C. See the FAA AGL Guide.
India
For Indian airport projects, additionally check the final selection against:
- Applicable DGCA requirements
- Airport-specific technical specifications
- Approved AGL drawings
- Project BOQ
- Employer's requirements
- Applicable Indian Standards
- Airport operator requirements
Always verify the applicable document edition before procurement, design approval or installation.
Procurement Checklist
Before Requesting a Quotation, Provide
- Airport name
- Runway designation
- Runway length
- Runway width
- Runway classification
- Approach category
- Elevated/inset requirement
- Number of fixtures
- Fixture spacing
- Required light colour
- Uni/bidirectional requirement
- LED/halogen requirement
- CCR current
- Existing transformer rating
- Existing connector arrangement
- Base-can details
- Cable details
- ALCMS/control requirements
- Required certifications
- Project specification
- Delivery requirement
What We Support
What Precision AGL Solutions Can Support
- Runway edge-light product selection
- Technical specification review
- Product datasheet review
- BOQ technical verification
- Fixture configuration selection
- Series-circuit compatibility review
- Isolating transformer matching
- Primary/secondary connector coordination
- Installation guidance
- Technical submittal review
- Photometric testing support
- Inspection and troubleshooting
- Replacement/retrofit assessment
- Maintenance documentation
The wider AGL offering includes photometric testing, inspection and maintenance, airport systems integration, training, documentation and compliance support, consistent with the main Solutions page.
FAQ
Runway Edge Light — Frequently Asked Questions
What are runway edge lights and where are they installed?
Runway edge lights are installed in two approximately parallel rows along the runway edges to give continuous visual definition of the runway's lateral limits. ICAO Annex 14 requires them on a runway intended for night use and on a precision approach runway for day or night use, placed along the edges of the runway area or outside it by not more than 3 m. Confirm the clause and edition for the project.
What is the spacing of runway edge lights?
ICAO Annex 14 specifies a spacing of not more than 60 m for an instrument runway and 100 m for a non-instrument runway. FAA practice limits spacing of medium- and high-intensity runway edge lights to 200 ft (61 m). All values are subject to the applicable provisions and the project design.
What colour are runway edge lights?
Under ICAO Annex 14, Volume I, runway edge lights are fixed lights showing variable white, except that they show red in the approach direction between the runway start and a displaced threshold, and a section at the remote end of the runway may show yellow, covering 600 m or one-third of the runway length, whichever is less. FAA practice differs: on instrument runways yellow replaces white on the last 2,000 ft (610 m) or half the runway length, whichever is less. Specify the colour configuration for the governing standard rather than just white.
What is the difference between elevated and inset runway edge lights?
Elevated fixtures sit above the pavement on a stake, base or frangible support, are easy to see and generally easier to maintain, but need aircraft clearance to be considered. Inset fixtures are installed flush with the pavement in a base can, selected where pavement clearance is critical or the approved design specifies in-pavement installation; they have lower mechanical exposure but need attention to drainage, sealing and pavement interface.
Do elevated runway edge lights need to be frangible?
Yes. Elevated lights on the movement area must be frangible and low enough to keep clearance for propellers and engine pods of jet aircraft (ICAO Annex 14). Use the fixture manufacturer's certified frangible coupling and mounting method.
Should I choose LED or halogen runway edge lights?
LED can offer long service life, lower maintenance, consistent optical performance, reduced energy consumption, rapid switching and good compatibility with modern AGL control systems, where specified by the project. Halogen or incandescent versions may be required by the specification or when existing infrastructure is being maintained; consider lamp rating and life, optical system, current setting, transformer and circuit compatibility, and spare-parts availability.
What are FAA L-861, L-862 and L-850C?
FAA AC 150/5340-30J identifies elevated runway edge-light classifications including L-861 (medium intensity) and L-862 (high intensity, typically precision runways), and inset runway edge lights are L-850C. The fixture specification is FAA AC 150/5345-46F. Verify the applicable edition before procurement.
How are runway edge lights connected to the AGL series circuit?
In a conventional series circuit each runway edge light is normally supplied through its own isolating transformer: constant current regulator, primary AGL cable, primary connector, isolating transformer, secondary connector, then the light. The fixture should be specified as part of the complete AGL circuit rather than as an independent electrical load.
What should be checked for series-circuit compatibility before procurement?
Confirm the CCR output current, circuit voltage, transformer rating, fixture electrical input, number of fixtures, cable length, circuit resistance and inductance, connector system, required intensity steps, ALCMS interface and monitoring requirements. This prevents an otherwise suitable fixture from being incorrectly selected for the existing circuit.
What are the common runway edge light faults and how are they troubleshot?
A light that is off may be due to lamp or LED failure, a secondary or primary connector problem, isolating transformer failure or an open series circuit. Other symptoms include low intensity, wrong colour, wrong direction, intermittent operation, water ingress and uneven lighting. Work along the circuit from the CCR, primary circuit, primary connector, isolating transformer, secondary connector, fixture input, lamp or LED, optics and alignment, rather than replacing a light when the fault is in the connector, transformer, cable or circuit. A light is not fully restored merely because it is illuminated: alignment, intensity, colour, electrical connection and physical condition must also be right. See the electrical safety warning before working on any circuit.
What information is needed to request a runway edge light quotation?
Provide the airport name, runway designation, length, width, classification and approach category, elevated or inset requirement, number of fixtures, spacing, required light colour, uni- or bidirectional requirement, LED or halogen requirement, CCR current, existing transformer rating and connector arrangement, base-can and cable details, ALCMS or control requirements, required certifications, project specification and delivery requirement.
Why It Matters
Why Select the Correct Runway Edge Light?
A runway edge light is not simply a lamp mounted beside a runway. Its performance depends on the interaction of:
Fixture + Optics + Colour + Installation + Transformer + Connector + Series Circuit + CCR + Control System + Maintenance
A technically correct product selection therefore requires the complete system to be considered.
Procurement Information for Indian Projects
Indian public tenders commonly ask for the documents below. State which ones your tender requires when you send the enquiry, so they are covered in the quotation.
- Manufacturer / OEM authorisation
- Country of origin and local-content declaration (for Make in India purchase preference)
- Type-test and routine-test certificates, and the FAA / ICAO / IEC compliance documents named in the specification
- Datasheets, drawings and installation instructions
- Warranty, delivery period and spares support
- GeM catalogue or tender-portal requirements, where applicable
Need the Right Runway Edge Light for Your Project?
Send us your runway classification, installation type, existing AGL circuit details, CCR current, fixture quantity, required light configuration and project specification. Our technical team can help identify the appropriate runway edge light configuration, electrical interface, mounting arrangement and supporting documentation.
Request Runway Edge Light Selection
Request Product Datasheet
Request Technical Submittal
Discuss Project Requirement
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Product Disclaimer
Product availability, configuration, dimensions, electrical characteristics, photometric performance, certifications and compliance status depend on the selected manufacturer and project specification. The technical values published on this page should not be treated as a substitute for the manufacturer's current approved Technical Data Sheet.
Final selection shall be based on the approved project specification, applicable aviation standards, authority requirements, manufacturer documentation and site conditions. Use of this page is also subject to the Legal Notice, Disclaimer & Terms of Use.
Standards and editions referenced on this site are listed on the Standards Reference page.