LED VS HALOGEN Runway Light
LED runway lights use semiconductor light sources, while halogen runway lights use tungsten-halogen filament lamps. Both can provide the required runway visual guidance, but they differ in energy consumption, service life, maintenance, thermal behaviour, and electrical design.
At a Glance
| Feature | LED Runway Light | Halogen Runway Light |
|---|---|---|
| Light source | LED | Tungsten-halogen lamp |
| Light generation | Semiconductor electroluminescence | Heated filament |
| Power consumption | Generally lower | Generally higher |
| Service life | Generally longer | Generally shorter |
| Lamp replacement | Usually less frequent | Periodic replacement required |
| Heat generation | Lower overall, but thermal management required | Higher |
| Optical system | LED + secondary optics | Lamp + reflector/lens |
| Electronics | Driver/control electronics required | Simpler source system |
| Maintenance | Generally lower | Generally higher |
| Failure mode | LED/driver degradation or failure | Filament ageing and failure |
How Each Source Generates Light
LED Runway Light
Electrical supply → driver/electronics → LED → optics → runway light beam. Light is produced directly by semiconductor electroluminescence.
Halogen Runway Light
Electrical supply → halogen filament → heat + light → reflector/optics → runway light beam. Light is produced by heating a filament until it glows.
Easy memory: LED = semiconductor → optics → runway beam. Halogen = hot filament → reflector/optics → runway beam.
Power Demand
LED
Generally offers lower energy consumption for a comparable runway-lighting function.
Halogen
Generally higher power demand, since electrical energy is used to both heat the filament and produce light.
However, the actual difference depends on the specific fixture design and required photometric performance.
Longevity & Degradation
LED
Generally have a longer operating life, with gradual light-output depreciation over time — although electronic or LED-module failures can still occur.
Halogen
Generally require more frequent replacement because the filament has a limited operating life: filament ageing leads to filament failure and lamp replacement.
Typical Maintenance Activities
LED Runway Light
- Cleaning optical surfaces
- Checking fixture condition
- Monitoring light output
- Inspecting electronics
- Checking thermal-management components
Halogen Runway Light
- Cleaning lenses and reflectors
- Checking fixture condition
- Replacing lamps
- Inspecting lamp holders and connections
- Checking optical alignment
Main difference: LED involves less routine light-source replacement; halogen requires periodic lamp replacement.
Technology Doesn't Decide Compliance
Both LED and halogen runway lights must ultimately provide the required optical performance, including luminous intensity, horizontal and vertical distribution, beam coverage, and colour characteristics.
LED technology does not automatically mean better photometric performance than halogen technology. The correct comparison is between the measured performance of the complete runway-light fixture.
Directing the Light
LED
LED → secondary optics → controlled beam. LEDs can be arranged with lenses and optical components to produce the required runway-light beam.
Halogen
Halogen lamp → reflector → lens/optics → controlled beam. Halogen sources emit light more broadly, so reflectors and optics play an important role in collecting and directing the light.
Thermal Behaviour
Halogen
Electrical power → hot filament → heat + light. Halogen runway lights can generate substantial heat.
LED
Electrical power → LED → light + heat → thermal management. LED fixtures are more efficient, but LED does not mean heat-free.
Poor thermal management can reduce LED light output, service life, reliability, and colour stability.
How Each Technology Fails
| Characteristic | LED Runway Light | Halogen Runway Light |
|---|---|---|
| Gradual output reduction | Possible | Possible |
| Sudden light-source failure | Possible | Common with filament break |
| Electronic failure | Possible | Less applicable to basic lamp |
| Lamp replacement | Usually less frequent | Regular requirement |
| Thermal management | Important | Important |
| Optical contamination | Possible | Possible |
CCR, Isolation Transformers & Compatibility
LED Fixture
May contain electronics to convert or control the supplied electrical energy for proper LED operation.
Halogen Fixture
Uses the electrical energy primarily to heat the filament — a simpler electrical arrangement at the source.
An LED replacement should not automatically be treated as a simple lamp substitution. System compatibility may need consideration for CCR operation, isolation transformer rating, operating current, power characteristics, monitoring systems, open/failed-lamp detection, and mechanical installation.
LED Retrofit vs Halogen Replacement
A successful conversion requires more than simply installing an LED source. The complete fixture and system should be evaluated for electrical compatibility, optical performance, and mechanical compatibility.
| Evaluation Area | What to Check |
|---|---|
| Electrical | Compatibility with existing CCR and isolation transformer |
| Optical | Required photometric performance is still met |
| Mechanical | Fixture fit, alignment, and installation arrangement |
| Monitoring | Open/failed-lamp detection and monitoring compatibility |
Where Each Technology Is Used
Both technologies can potentially be used for applications such as runway edge lights, runway centreline lights, runway threshold/end lights, touchdown-zone lights, and other specified runway visual aids.
The technology choice does not change the operational purpose of the light — required runway function → LED or halogen fixture → required optical output.
Full Engineering Parameters
| Parameter | LED Runway Light | Halogen Runway Light |
|---|---|---|
| Source technology | Semiconductor | Tungsten-halogen filament |
| Energy efficiency | Generally higher | Lower |
| Power consumption | Generally lower | Higher |
| Service life | Generally longer | Shorter |
| Routine lamp replacement | Lower | Higher |
| Heat generation | Lower overall, but thermal management required | Higher |
| Electronics | More significant | Simpler at source level |
| Failure mechanism | LED/driver/system-related | Filament-related |
| Optical design | LED + secondary optics | Reflector + lens |
| Maintenance | Generally lower | Generally higher |
| Photometric compliance | Depends on fixture design | Depends on fixture design |
LED vs Halogen Runway Light
LED and halogen runway lights differ mainly in source technology, not in required outcome. Both must meet the same photometric, colour, electrical, mechanical, and operational requirements for their specific runway-lighting function.
LED runway lights generally offer lower energy use, longer service life, and reduced routine source maintenance, with greater dependence on electronics and thermal management. Halogen runway lights use filament-based technology with higher power consumption, higher heat generation, and more frequent lamp replacement.
The most important point is that the runway-light technology alone does not determine compliance. Both LED and halogen fixtures must meet the applicable photometric, colour, electrical, mechanical, and operational requirements for their specific runway-lighting function.
Engineering & Expert Notes
Check Circuit Loading After the Change
CircuitThe load differs. Review CCR and transformer rating.
Verify Intensity at Each Step
PhotometryConfirm output across brightness steps.
Check Colour Over Time
ColourInclude chromaticity in periodic checks.
Update Maintenance Procedures
MaintenanceLED maintenance differs. Revise tasks and spares.
Frequently Asked Questions
LED = semiconductor → optics → runway beam, with efficient, long life and lower maintenance. Halogen = hot filament → reflector/optics → runway beam, with higher heat, higher power, and lamp replacement.
No. LED technology does not automatically mean better photometric performance than halogen technology. The correct comparison is between the measured performance of the complete runway-light fixture.
Not automatically. An LED replacement should not be treated as a simple lamp substitution — CCR operation, isolation transformer rating, operating current, monitoring systems, and mechanical installation may all need evaluation.
No. LED fixtures are more efficient, but LED does not mean heat-free. Poor thermal management can reduce LED light output, service life, reliability, and colour stability.
Because the filament has a limited operating life. Filament ageing leads to filament failure, requiring periodic lamp replacement, which is generally less frequent with LED sources.
Yes. Both LED and halogen can potentially be used for runway edge lights, centreline lights, threshold/end lights, and touchdown-zone lights. The technology choice does not change the operational purpose of the light.
Governing Documents
For an actual project design, always verify the current edition of the applicable documents.
FAA AC 150/5340-30
Design and Installation Details for Airport Visual Aids — photometric, electrical, and installation requirements applicable to both LED and halogen runway-light fixtures.
ICAO Annex 14, Volume I
Aerodrome Design and Operations — photometric and colour characteristics of aeronautical ground lights, regardless of light-source technology.
FAA AC 150/5345-46
Specification for Runway, Taxiway, Heliport, and Vertiport Light Fixtures — the governing equipment spec for LED and halogen runway-light fixture construction.
FAA AC 150/5345 Series
Specifications for constant current regulators, isolation transformers, and other airfield lighting equipment relevant to LED retrofit compatibility.
Final Engineering Note
Do not select a runway-light source technology based on efficiency claims alone. Verify complete fixture compliance with the applicable photometric, electrical, and mechanical requirements.
LED and halogen are two different ways to produce the same required runway-light function — the fixture, not the source technology, must demonstrate compliance.
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