Halogen Lamp
The traditional incandescent light source used in legacy AGL fixtures. Despite being superseded by LEDs, halogen lamps remain widely deployed in many airfields due to their warm, consistent colour output, excellent colour rendering (CRI ≈ 100), and simple control via series circuits.
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What Is It?
A Halogen Lamp is a type of incandescent lamp that uses a tungsten filament enclosed in a compact, high-temperature quartz envelope filled with a halogen gas (typically iodine or bromine). The halogen cycle allows the filament to operate at higher temperatures than standard incandescent lamps, producing a brighter, whiter light with higher efficacy and longer life. In AGL applications, halogen lamps are available in various wattages (e.g., 50W, 100W, 200W) and are designed to operate directly on the series circuit current (typically 6.6A) via an isolating transformer. They are used extensively in runway, taxiway, and approach lighting fixtures, and remain the primary light source in many legacy systems.
Purpose & Function
The halogen lamp's purpose, within an AGL fixture, is to provide a light source bright and consistent enough for pilots to see and correctly interpret from the air, in a package robust enough to survive the airfield's vibration, temperature extremes, and constant on/off cycling. Its self-cleaning halogen cycle — which redeposits evaporated tungsten back onto the filament — is what lets it sustain high brightness over a useful service life rather than dimming and blackening the envelope the way a standard incandescent lamp would, making its output stable enough to be trusted for pilot guidance throughout its rated life. While LED technology now offers longer life and lower power consumption, halogen lamps remain widely deployed because they operate directly on the series circuit's stepped current without additional driver electronics, which keeps many legacy fixtures simple, field-proven, and straightforward to maintain.
Where Is It Used?
Halogen lamps are used in a wide range of AGL fixtures, particularly in older installations:
- Runway Edge & Centreline Lights: 50W, 100W, or 200W lamps for edge and centreline guidance.
- Threshold & End Lights: Coloured (green/red) lamps for threshold and end marking.
- Taxiway Lights: Lower wattage (50W) lamps for taxiway edge and centreline.
- Approach Lighting: High-intensity halogen lamps for barrettes and flashing lights.
- PAPI & VASI: Specialised halogen lamps with filters to produce the required red/white transition.
- Obstruction Lights: Halogen lamps for obstruction marking, often with red filters.
- Beacons & Wind Cones: Halogen lamps for rotating beacons and illuminated windsocks.
Installation & Location
The lamp is fitted into its holder inside the fixture housing, pushed and (where the base type requires it) twisted home so the contacts seat fully and squarely, since a partially seated lamp can arc, overheat, or fail prematurely. Handling is done without bare-hand contact on the glass envelope, using a cloth or gloves, as skin oils left on a halogen bulb create a hot spot that shortens its life or causes early failure. Once fitted, the lamp is centred in the reflector or prism's optical focus using the holder's locating features or a shim, so the beam pattern the fixture produces matches its design photometrics, and the fixture is resealed with a fresh gasket before the top cover is replaced.
How Does It Work?
A halogen lamp works on the principle of incandescence: an electric current passes through a tungsten filament, heating it to a temperature of about 2,500–3,000°C, causing it to emit light. The halogen gas (iodine or bromine) within the quartz envelope reacts with tungsten atoms that evaporate from the filament, forming tungsten halide compounds. These compounds are then transported back to the filament where they decompose, redepositing tungsten onto the filament. This halogen cycle extends lamp life and keeps the quartz envelope clean, maintaining high light output. The lamp operates on the series circuit through an isolating transformer, with intensity controlled by the CCR's current steps (typically 5 steps: 2.8A to 6.6A).
The Halogen Cycle & Control Logic
Current Heats the Tungsten Filament
Temperature reaches roughly 2,500°C – 3,000°C
Filament Emits Light
Incandescence produces the visible output
Tungsten Atoms Evaporate
Hot filament sheds tungsten into the quartz envelope
Halogen Gas Reacts With the Vapour
Iodine or bromine forms a tungsten halide compound
Compound Decomposes at the Filament
Tungsten redeposits back onto the filament surface
The Cycle Repeats Continuously — Extending Lamp Life While Keeping the Quartz Envelope Clean
Physical Construction
The lamp is built around a coiled tungsten filament suspended on molybdenum support wires inside a small-volume fused-quartz envelope, which is pinch-sealed at one or both ends to hold the halogen fill gas under pressure. Quartz is used rather than ordinary glass because it withstands the high envelope-wall temperature the halogen cycle depends on without softening or devitrifying. Filament position within the envelope is held to a tight tolerance, since AGL fixtures rely on precise, repeatable filament placement relative to the reflector or prism to hit their certified beam pattern — a lamp with the filament even slightly off-axis will shift the beam. The lamp base — typically a prefocus or bipost type matched to the fixture's lamp holder — locates the envelope at a fixed height and orientation the moment the lamp is inserted, so no field adjustment of the light source itself is normally required after a lamp change.
Technical Parameters
| Parameter | Typical Value |
|---|---|
| Wattage | 30W, 45W, 100W, 150W, 200W (common AGL ratings) |
| Luminous Flux | 900-3,500 lumens (depending on wattage) |
| Colour Temperature | 3,000K – 3,200K (warm white) |
| Colour Rendering Index (CRI) | 100 (excellent colour rendering) |
| Lifetime (Average) | 1,000 – 2,000 hours (depending on wattage and dimming) |
| Operating Voltage | Set by lamp wattage at fixed current (V ≈ W ÷ 6.6A); typically 5–35V depending on wattage |
| Current Rating | Fixed at 6.6A (or the active CCR step, 2.8A–6.6A) regardless of lamp wattage |
| Lamp Base | GX6.35, GY9.5, or special AGL base (varies by manufacturer) |
| Envelope | Quartz glass (high-temperature resistant) |
| Gas Fill | Iodine or bromine with inert gas (argon/krypton) |
Electrical Requirements
| Requirement | Typical Value |
|---|---|
| Circuit Position | Secondary (low-voltage) circuit, downstream of isolating transformer |
| Rated Voltage | Set by lamp wattage at the fixed series current (V ≈ W ÷ 6.6A); varies lamp-to-lamp, not a fixed tier |
| Rated Current | Fixed by the series circuit — 6.6A (or the active CCR step), same on primary and secondary regardless of lamp wattage |
| Isolation | Not directly connected to primary series loop; isolated via transformer |
| Insulation Resistance | ≥ 50 MΩ at lamp holder/socket |
| Fault Protection | Lamp failure open-circuits the secondary only; does not break the primary series loop |
| Intensity Response | Brightness tracks CCR-set primary current step via the transformer ratio |
Photometric Requirements
| Parameter | Typical Value |
|---|---|
| Luminous Flux | 900–3,500 lumens, depending on wattage rating |
| Colour Temperature | 3,000K–3,200K (warm white), consistent across the rated life |
| Colour Rendering Index (CRI) | ≈ 100 (incandescent-type spectrum) |
| Lumen Maintenance | ≥ 90% of initial flux at 50% of rated lifetime; end-of-life governed by filament failure rather than gradual dimming |
| Filament/Envelope Output Pattern | Near-omnidirectional point source, shaped by the host fixture's reflector/lens to the required beam pattern |
| Isocandela Distribution | Achieved fixture-side; lamp itself supplies raw flux matched to the fixture's optical design |
| Intensity Step Response | Output tracks the CCR's current schedule (2.8A–6.6A) proportionally to lamp wattage |
| Flux Tolerance | ± 10% of rated lumen output, lamp-to-lamp within a production batch |
| Test Method | Integrating sphere/goniophotometer at manufacture; visual/photometric spot-check on installation |
Applicable Standards
ICAO Annex 14
Photometric requirements for AGL lamps (intensity, colour)
FAA AC 150/5345-46
Specification for Runway, Taxiway, Heliport, and Vertiport Light Fixtures (fixture/lamp compatibility)
IEC 60357
Tungsten halogen lamps (non-vehicle) — performance specifications
ANSI C78.357
Tungsten halogen lamps (non-vehicle) — dimensional and performance data
Installation Requirements
Lamp Inspection
Pre-InstallationInspect the quartz envelope and base pins for shipping or handling damage before insertion, avoiding contact with bare fingers on quartz-envelope lamps to prevent early failure.
Correct Lamp Base Matching
Pre-InstallationConfirm the lamp's prefocus or bipost base type matches the fixture's lamp holder before insertion, since the wrong base cannot seat correctly.
Seating & Orientation Check
MechanicalSeat the lamp fully in its keyed holder position, confirming filament location relative to the reflector or prism without requiring field adjustment.
Pre-Energisation Sign-off
DocumentationRecord lamp type, rating, and seating confirmation as-built before the circuit is energised for lumen output and current verification.
Testing & Commissioning
Filament Continuity & Insertion Check
Pre-EnergisationVisually inspect the filament and verify correct seating of the lamp in its holder before the circuit is energised.
Lumen Output Verification
EnergisationMeasure light output with a calibrated photometer at rated current, confirming it meets the lamp's specified lumen rating.
Current & Voltage Verification
EnergisationWith the CCR energised, confirm the lamp draws the correct current and voltage at each intensity step.
Dimming Step Response
EnergisationCycle the CCR through every intensity step and confirm the lamp responds correctly and smoothly at each.
Burn-in Test
Final AcceptanceRun a short burn-in period to identify and reject any lamp with an infant failure before final sign-off.
Documentation & As-Built Sign-off
Final AcceptanceRecord lumen output, current draw, and burn-in results in the commissioning dossier.
Inspection & Maintenance
Lumen Output Check
AnnualMeasure light output against rated values, since blackening and lumen depreciation build gradually over lamp life.
Filament & Vibration Damage Inspection
AnnualInspect for filament sag or breakage risk, particularly on fixtures subject to sustained vibration.
Quartz Envelope Cleanliness Check
Semi-annualCheck the quartz envelope for skin-oil or handling contamination, which causes localized hot spots and early failure.
Dimming Response Verification
AnnualConfirm the lamp responds correctly across the dimming range, flagging any mismatch with the control system.
Common Field Issues
Lamp Blackening & Depreciation
Over time, the halogen cycle may become less effective, leading to tungsten deposition on the quartz envelope (blackening) and reduced light output. Also, lamp lumen depreciation is inherent. Regular photometric checks and replacement of aged lamps is essential.
Filament Breakage from Vibration
AGL fixtures are subject to significant vibration from aircraft and ground vehicles. The tungsten filament can break due to mechanical stress, causing premature lamp failure. Use of shock-resistant lamps and proper mounting is recommended.
Quartz Envelope Contamination
Oil or dirt from fingers can contaminate the quartz envelope, causing hot spots and cracking. Always handle halogen lamps with clean gloves or use a protective sleeve during installation.
Incorrect Dimming Response
Halogen lamps have a non-linear response to current changes; at low currents, colour temperature drops and light output decreases rapidly. Ensure the CCR steps are correctly calibrated for the lamp type.
Troubleshooting Guide
Lamp Fails Well Before Rated Life
Reduced or Dimming Light Output
Cracked Quartz Envelope
Light Appears Dim or Off-Colour at a Reduced Intensity Step
Failure Modes & Root Causes
Premature Filament Failure
Tungsten Blackening / Lumen Depreciation
Quartz Envelope Cracking
CCR Step Miscalibration Misread as Lamp Fault
Safety & Operational Notes
No Bare-Hand Contact with the Envelope
HandlingAlways handle the lamp by its base, using a clean cloth or gloves if the quartz envelope must be touched; finger oils create a localised hot spot that stresses the quartz and can cause premature cracking or failure.
Allow the Lamp to Cool Before Handling
Personnel SafetyHalogen lamps run at high surface temperature during operation; allow the lamp and fixture housing to cool fully before relamping to avoid burns.
Electrical Isolation Before Relamping
Electrical SafetyDe-energise and lock out the CCR or supply circuit before removing or installing a lamp, and verify zero energy at the fixture before opening the housing.
Shattered Envelope Hazard
Personnel SafetyWear eye protection when installing or removing a lamp, since a contaminated or thermally stressed quartz envelope can crack or shatter under normal handling; treat any lamp with visible surface marks or a prior overdrive event as higher risk.
Match Lamp Rating to CCR Output
Electrical SafetyConfirm the CCR is set to the correct current step for the installed lamp type before re-energising; overdriving a halogen lamp beyond its rated current shortens filament life and increases the risk of envelope failure.
Disposal of Failed Lamps
OperationalDispose of failed or removed lamps according to site waste procedures, and avoid discarding a cracked or partially shattered lamp loose where broken glass could become foreign object debris.
Verify Output Before Closing Out
ComplianceAfter relamping, confirm the fixture strikes correctly and reaches expected intensity at the commissioned CCR step; a lamp that appears dim or off-colour at a low intensity step may be functioning correctly given halogen's non-linear response to reduced current.
Restore to Compliant State
ComplianceDo not leave a fixture in service with an incorrect lamp type or CCR mismatch; verify photometric output meets the fixture's rated requirements before closing out the work.
Airport Lighting Halogen Fixture
An airport lighting halogen fixture uses a halogen lamp behind the lens and filter. It works well with older series circuits but has a much shorter life than LED, so lamp replacement is a regular maintenance task. Replace with the correct wattage and type, and check the lens, seal and filter at the same time. See the LED technology page for the alternative.
Engineering & Expert Notes
A Single Fingerprint Can Cause a Later, Unrelated-Looking Failure
HandlingSkin oil contamination on the quartz envelope creates a localised hot spot that devitrifies the quartz over subsequent burn hours; the resulting failure can occur weeks after the contaminating handling event, which makes it easy to blame the wrong maintenance visit when investigating a premature lamp failure.
Non-Linear Dimming Response Is Normal, Not a Fault
ElectricalHalogen lamps don't dim linearly with current, so a lamp running noticeably dimmer or more amber at a low CCR step than expected is often behaving correctly rather than failing; compare against the lamp's published output curve for that step before condemning it as a bad lamp.
Repeated Thermal Cycling Embrittles the Lead Wires
Failure ModeFixtures that cycle frequently between on and off, rather than running continuously, subject the lamp's internal lead wires and seal to more thermal cycling stress than steady operation does; where nuisance failures cluster on frequently-switched circuits, consider that duty cycle itself as a contributing factor, not just lamp quality.
Overdriving Trades Short-Term Output for Long-Term Life
ElectricalRunning a halogen lamp above its rated current to compensate for a perceived dimness elsewhere in the circuit shortens filament life disproportionately to the output gained; trace the actual cause of low brightness (loop balance, transformer sizing, ageing lamps elsewhere) rather than compensating by overdriving the replacement lamp.
Storage Conditions Affect Shelf Life
HandlingSpare lamps stored in humid or high-temperature conditions, or exposed to UV through packaging, can degrade before they're ever installed; keep spares in their original sealed packaging in a stable environment and rotate stock so older spares are used first.
Consider LED Retrofit Economics Before a Like-for-Like Replacement
RetrofitOn fixtures nearing an overhaul cycle anyway, compare the ongoing relamping and CCR-step-matching burden of halogen against a properly step-matched LED retrofit before defaulting to another like-for-like lamp order; the right answer depends on remaining fixture life and loop composition, not on lamp cost alone.
Frequently Asked Questions
Short answers about the Halogen Lamp: what it is, how it works, typical specifications, standards, maintenance and common faults.
Q1What is a Halogen Lamp?
A Halogen Lamp is a type of incandescent lamp that uses a tungsten filament enclosed in a compact, high-temperature quartz envelope filled with a halogen gas (typically iodine or bromine). The halogen cycle allows the filament to operate at higher temperatures than standard incandescent lamps, producing a brighter, whiter light with higher efficacy and longer life.
Q2What is the purpose of a Halogen Lamp?
The halogen lamp's purpose, within an AGL fixture, is to provide a light source bright and consistent enough for pilots to see and correctly interpret from the air, in a package robust enough to survive the airfield's vibration, temperature extremes, and constant on/off cycling.
Q3Where is a Halogen Lamp used and installed?
Halogen lamps are used in a wide range of AGL fixtures, particularly in older installations: Runway Edge & Centreline Lights: 50W, 100W, or 200W lamps for edge and centreline guidance. Threshold & End Lights: Coloured (green/red) lamps for threshold and end marking. Taxiway Lights: Lower wattage (50W) lamps for taxiway edge and centreline. Approach Lighting: High-intensity halogen lamps for barrettes and flashing lights. PAPI & VASI: Specialised halogen lamps with filters to produce the required red/white transition. Obstruction Lights: Halogen lamps for obstruction marking, often with red filters. Beacons & Wind Cones: Halogen lamps for rotating beacons and illuminated windsocks.
Q4How does a Halogen Lamp work?
A halogen lamp works on the principle of incandescence: an electric current passes through a tungsten filament, heating it to a temperature of about 2,500–3,000°C, causing it to emit light. The halogen gas (iodine or bromine) within the quartz envelope reacts with tungsten atoms that evaporate from the filament, forming tungsten halide compounds. These compounds are then transported back to the filament where they decompose, redepositing tungsten onto the filament.
Q5What are the typical technical parameters of a Halogen Lamp?
Typical values are — Wattage: 30W, 45W, 100W, 150W, 200W (common AGL ratings); Luminous Flux: 900-3,500 lumens (depending on wattage); Colour Temperature: 3,000K – 3,200K (warm white); Colour Rendering Index (CRI): 100 (excellent colour rendering); Lifetime (Average): 1,000 – 2,000 hours (depending on wattage and dimming); Operating Voltage: Set by lamp wattage at fixed current (V ≈ W ÷ 6.6A); typically 5–35V depending on wattage; Current Rating: Fixed at 6.6A (or the active CCR step, 2.8A–6.6A) regardless of lamp wattage; Lamp Base: GX6.35, GY9.5, or special AGL base (varies by manufacturer); Envelope: Quartz glass (high-temperature resistant).
Q6What are the electrical requirements for a Halogen Lamp?
Typical requirements are — Circuit Position: Secondary (low-voltage) circuit, downstream of isolating transformer; Rated Voltage: Set by lamp wattage at the fixed series current (V ≈ W ÷ 6.6A); varies lamp-to-lamp, not a fixed tier; Rated Current: Fixed by the series circuit — 6.6A (or the active CCR step), same on primary and secondary regardless of lamp wattage; Isolation: Not directly connected to primary series loop; isolated via transformer; Insulation Resistance: ≥ 50 MΩ at lamp holder/socket; Fault Protection: Lamp failure open-circuits the secondary only; does not break the primary series loop.
Q7What photometric requirements apply to a Halogen Lamp?
Typical requirements are — Luminous Flux: 900–3,500 lumens, depending on wattage rating; Colour Temperature: 3,000K–3,200K (warm white), consistent across the rated life; Colour Rendering Index (CRI): ≈ 100 (incandescent-type spectrum); Lumen Maintenance: ≥ 90% of initial flux at 50% of rated lifetime; end-of-life governed by filament failure rather than gradual dimming; Filament/Envelope Output Pattern: Near-omnidirectional point source, shaped by the host fixture's reflector/lens to the required beam pattern; Isocandela Distribution: Achieved fixture-side; lamp itself supplies raw flux matched to the fixture's optical design.
Q8Which standards apply to a Halogen Lamp?
The main references are ICAO Annex 14 — Photometric requirements for AGL lamps (intensity, colour); FAA AC 150/5345-46 — Specification for Runway, Taxiway, Heliport, and Vertiport Light Fixtures (fixture/lamp compatibility); IEC 60357 — Tungsten halogen lamps (non-vehicle) — performance specifications; ANSI C78.357 — Tungsten halogen lamps (non-vehicle) — dimensional and performance data. Always verify the current edition and your aerodrome's approved requirements.
Q9How often should a Halogen Lamp be inspected and maintained?
Typical maintenance tasks and intervals are: Lumen Output Check (annual); Filament & Vibration Damage Inspection (annual); Quartz Envelope Cleanliness Check (semi-annual); Dimming Response Verification (annual). Your airport's approved maintenance programme takes precedence.
Q10How do I troubleshoot common Halogen Lamp faults?
Common symptoms covered are: Lamp Fails Well Before Rated Life; Reduced or Dimming Light Output; Cracked Quartz Envelope; Light Appears Dim or Off-Colour at a Reduced Intensity Step. For example, for "Lamp Fails Well Before Rated Life": Likely Cause: Filament breakage from vibration, incorrect CCR current causing overdriving, or contamination on the quartz envelope from bare-hand handling during installation. Diagnostic Steps: Inspect the failed lamp's filament for a clean break versus melted appearance; check CCR output current against the lamp's rated value; inspect the quartz envelope for oily fingerprints or hot-spot discolouration. Corrective Action: Replace with a shock-resistant lamp rated for the application, correct CCR current setting if overdriving was found, and handle replacement lamps only with clean gloves or a protective sleeve.
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