The Engineering Reality Behind India’s Airport Lighting Boom

The Indian aviation industry is growing at an unbelievable speed, with the aim of having around 220+ functional airports being made part of the nation’s infrastructure development plan. With such a fast-growing industry, there is creating more opportunities, but there is also a major problem being faced in terms of Airport Project Designs, the lack of proper specification in Airfield Ground Lighting (AGL) systems.

Project delays and non compliance are no longer due to any supply shortages issues, but by incorrect engineering specifications during the design phase. Misalignment with CCR ratings, wrong fixture selections, and non-compliance with ICAO/DGCA standards may pose a significant threat to operations and approvals.

For airport project engineers, the challenge is clear: AGL is not just a procurement decision; it is a precision engineering system that directly impacts safety, compliance, and long-term performance.

What is Airfield Ground Lighting (AGL)?

The Airfield Ground Lighting (AGL) system is an extremely regulated lighting system used in airports to guide aircraft during landing, takeoff, taxiing, and ground movement, especially under low visibility conditions.

It includes:

• Runway lighting systems
• Taxiway lighting systems
• Approach lighting systems
• Apron and obstruction lighting systems

AGL systems are designed to achieve high levels of performance in various fields such as photometrics, electrical, performance standards and environmental concerns, ensuring consistent visibility and operational safety.

What Airport Project Engineers Must Understand About AGL System Design

AGL systems are completely different from traditional lighting systems. AGL runs on a series circuit architecture, generally running on a constant current of 6.6A to maintain uniform light output in all lamps.

1. Series Circuit Structure

The AGL structure does not follow the parallel circuit design but rather adopts a series loop arrangement. In the series circuit structure, all lamps are linked together via isolation transformers. This ensures that the failure of one fixture does not affect the entire circuit.

2. Constant Current Regulator (CCR)

Constant current regulators (CCRs) are significant elements in AGL systems that help regulate the amount of current (from 2.8A to 6.6A) to manage light intensity level. The proper sizing of CCRs will ensure:

• Maintain uniform brightness
• Prevent overloading
• Ensure system stability

3. CAT I / CAT II / CAT III Systems

Runway lighting systems are categorized based on visibility requirements:

• CAT I – Basic operations
• CAT II – Low visibility
• CAT III – Near-zero visibility landing

Each category demands specific intensity levels, redundancy, and photometric performance.

4. Inset vs Elevated Fixtures

• In-set lights are designed to be flush mounted on runway areas to prevent aircraft damage
  
• Elevated lights are used in taxiway sections and other areas that are not as important

5. Photometric Requirements

Fixtures for AGL lighting should adhere to specific beam angle, brightness and color requirements as per ICAO regulations.

Certification Standards Every AGL Supplier in India Must Meet

Compliance is not optional in airport lighting—it is mandatory for project approval and operation.

ICAO Annex 14

Defines:

• Light intensity
• Beam spread
• Color specifications
• Placement geometry

FAA AC 150/5345 Series

Covers product-level standards, including:

• Fixture performance
• Testing procedures
• Material durability

AAI (Airports Authority of India) Specifications

Local authority requirements aligned with Indian airport projects:

• Installation guidelines
• Performance benchmarks
• Inspection protocols

ISO 9001 & Quality Systems

Ensures:

• Manufacturing consistency
• Quality control processes

How to Specify Airfield Ground Lighting for an Indian Airport Project: A Practical Guide

Step	Specification Area	Key Considerations	Technical Impact / Outcome
1	Runway Category Assessment	Determine CAT I, CAT II, or CAT III requirements	Defines fixture type, intensity levels, and system redundancy
2	Fixture Selection by Zone	– Runway edge: High-intensity, bidirectional – Centreline: Inset, precision-aligned – TDZ: High photometric output – Taxiway: Medium intensity, directional – Apron: Wide beam coverage	Ensures correct illumination, compliance with ICAO photometric standards, and operational safety
3	CCR Sizing & Load Calculation	Evaluate total circuit length, number of fixtures, and cable resistance	Prevents voltage drops, ensures uniform illumination, and maintains system stability
4	Cable Routing & Circuit Design	Use aviation-grade cables, plan redundancy loops, minimize voltage loss	Improves system reliability, reduces failure risk, and ensures efficient power distribution
5	Tender Specification Writing	Include photometric specs, IP67/IP68 rating, SS316/anodized materials, ICAO/FAA/AAI compliance, and test certifications	Ensures procurement of compliant, durable, and high-performance AGL systems

Specification Mistakes That Cause AGL Project Failures in India

Even the most well planned airport projects may suffer from delays and non-compliance because of the crucial mistakes made in Airfield Ground Lighting (AGL) systems. Here are some of the most prevalent ones that are usually made during Indian airport projects:

1. Mixing LED and Halogen Fixtures

By using LED luminaires with halogen luminaires in a same series circuit, there is an electrical mismatch caused by the different load requirements of the two luminaire types. This often results in unstable performance, inconsistent light output and long-term system reliability issues.

2. Incorrect CCR Sizing

The improper sizing of the Constant Current Regulator (CCR) is one of the commonest mistakes made during engineering. Either under sizing or over-sizing of the CCR causes voltage drop, dimming, flickering of the lights, as well as lighting disparity. This reduces overall efficiency and the lifespan of the system.

3. Wrong Intensity Class Selection

Selecting fixtures that are not matchable with the necessary category of runway (CAT I, CAT II, or CAT III) will directly lead to nonconformity to the ICAO regulations. This problem directly affects the safety issues and may cause failure during the inspection phase.

4. Ignoring IP Ratings

India’s harsh environmental conditions, especially heavy monsoons and floods time, it is vital to have lighting fixtures with at least IP67 or IP68 rating to ensure maximum protection against water ingress, leading to premature failures and maintenance issues.

5. Underspecified Isolation Transformers

Isolation transformers are crucial for maintaining balance in series circuits. Any under-specification could lead to imbalanced circuits, inconsistent voltage and an increase in malfunctioning and maintenance problems, especially in major systems such as runways.

6. Skipping Photometric Validation

Without proper photometric testing, it cannot be ensured that the luminaires comply with the necessary beam angles, light intensities and color specification. This may lead to non-compliance with ICAO standards and reduced visibility for pilots.

Why Indian Climatic Conditions Demand Specific AGL Manufacturing Standards

India presents unique environmental challenges:

Monsoon & Flooding

Requires:

• IP67/IP68 sealed fixtures
• Waterproof connectors

High Temperature

Demands:

• Heat-resistant components
• Efficient thermal design

Dust & Pollution

Requires:

• Sealed optics
• Anti-dust coatings

Coastal Corrosion

Needs:

• SS316 stainless steel
• Anti-corrosion coatings

Voltage Fluctuations

Systems must handle:

• Unstable power supply
• Surge protection

What to Technically Evaluate When Selecting a Certified AGL Manufacturer in India

Choosing the right supplier is an engineering decision.

Evaluate:

• Photometric test reports (ICAO compliance)
• Type test certificates (FAA / IEC)
• Factory audit readiness
• On-site installation & commissioning support
• Spare parts availability
• Lead time for CCR and critical components

A reliable manufacturer will not hesitate to provide full technical transparency and documentation.

Specify with Confidence — Partner with an Engineering-Driven Manufacturer

Airfield ground lighting is not just about illumination; it involves engineering, compliance, specifications and safety considerations. Proper decision-making in terms of specifications will determine the success or failure of your project and avoid costly delays and rework.

Collaborating with a qualified and skilled manufacturer such as Sipani Energy will guarantee that all the components, including CCR systems and inset fixtures, will be manufactured according to international and Indian standards and Indian environmental demands.

FAQs

What is AGL in aviation?

AGL (Airfield Ground Lighting) refers to the lighting system used for guiding planes during landing, takeoff and mground movement..

What is ICAO Annex 14?

ICAO Annex 14 is a set of internationally recognized guidelines specifying technical standards for airfield lighting.

What is CCR in airfield lighting?

CCR (Constant Current Regulator) regulates current flow in the AGL network to provide uniform illumination.

What is the difference between CAT II and CAT III lighting?

CAT II and CAT III refer to lighting systems used during low and zero visibility operations.