Can Aviation Obstruction Lights Be Modified into Marine Navigation Lanterns?

Why appearance, flash rate, beam angle, and IP rating are not enough to prove suitability for marine AtoN applications

In marine lantern procurement, buyers often face a common question: some aviation obstruction light manufacturers modify their products slightly and offer them as “marine navigation lanterns." These lights may also use LED sources, solar power, waterproof housings, and flashing control. Their appearance may even look similar to some compact marine lanterns.

This often leads buyers to ask:

If an aviation obstruction light is adjusted in flash rate, beam angle, and housing design, can it be used as a marine navigation lantern?

The answer is: not simply.

Aviation obstruction lights may share certain technologies with marine lanterns, such as LEDs, solar power systems, controllers, and outdoor protection design. However, a real marine navigation lantern is not just a lamp that can flash, shine, and resist water. It is an optical, waterproofing, power, and signal system designed specifically for marine aids to navigation.

Simply changing the flash rate, widening the beam angle, replacing the housing, or providing a peak luminous intensity value does not prove that a product is suitable for long-term use on buoys, channels, ports, or offshore platforms.

1. Aviation obstruction lights and marine navigation lanterns serve different safety purposes

The main purpose of an aviation obstruction light is to mark obstacles in the air, such as towers, buildings, chimneys, wind turbines, power structures, and airport-area obstacles. Its users are aircraft and pilots. Its core function is to indicate the position of an aerial obstruction.

A marine navigation lantern, however, is used to provide visual navigation signals for vessels. It may be installed on buoys, beacons, lighthouses, port structures, waterway facilities, or offshore platforms. Its users are vessels, port authorities, waterway managers, and AtoN operators.

Its core purpose is not simply to show that “there is an object here." Instead, it communicates navigational meaning through light colour, flash rhythm, luminous intensity, range, position, optical distribution, and long-term signal stability.

Therefore, these two products are designed for different safety systems.

An aviation obstruction light answers the question:

Can a pilot identify this aerial obstacle?

A marine navigation lantern answers the question:

Can a vessel reliably identify this aid to navigation by its colour, rhythm, position, and signal meaning under real marine conditions?

For this reason, the suitability of a light for marine AtoN use cannot be judged only by whether it emits light, flashes, uses solar power, or carries an IP rating. The real question is:

Can it provide a stable, verifiable, and maintainable navigation signal in a marine environment over its service life?

2. Changing the flash rate does not mean meeting marine lantern requirements

Some manufacturers may believe that if the control program of an aviation light is modified to flash at a certain frequency, it can meet marine lantern requirements. This is an incomplete understanding.

The flash character of a marine lantern is not simply “flashing several times" or “flashing a certain number of times per minute." In marine aids to navigation, the flash character is part of the navigational language. Different rhythms may indicate different buoy types, channel meanings, hazard warnings, or navigation information.

Therefore, the flash character of a marine lantern must be evaluated together with:

• effective luminous intensity;
• visible range;
• duty cycle;
• battery capacity;
• solar panel configuration;
• LED thermal performance;
• controller output;
• long-term autonomy;
• field recognition;
• project acceptance requirements.

A light that can be programmed to flash at a certain frequency is not necessarily able to maintain sufficient effective intensity, stable range, and autonomy under that flash character.

For example, some products advertise a very attractive maximum luminous intensity. However, this value may have been measured under the most favourable conditions: fully charged battery, maximum brightness, short flash duration, low duty cycle, or even only at one peak direction.

If the maximum intensity is measured under a condition such as a 1:8 duty cycle, this does not represent the actual usable luminous intensity under all flash characters.

This is critical for buyers.

In real projects, a marine lantern may need to operate under one specific flash character among many IALA rhythm options. Not all flash characters have the same duty cycle. A different duty cycle means different lighting duration, current consumption, LED heat load, and battery autonomy.

If a supplier only provides a “maximum intensity" value without explaining the test flash character, duty cycle, brightness setting, and battery condition, that data has limited value for project selection.

A professional marine lantern selection should not only ask:

What is the maximum luminous intensity?

It should also ask:

What is the effective luminous intensity under the required flash character?
What is the visible range under this operating mode?
What is the autonomy under this flash character?
Has the thermal stability of the LED been verified under this condition?

Without these answers, “maximum intensity" is only an ideal test value, not a reliable representation of field performance.

3. Widening the beam angle does not mean achieving proper marine optical distribution

Another common claim is:

The aviation light’s beam angle is not wide enough, so we can make it wider.

For marine navigation lanterns, however, beam angle is not simply about “spreading the light wider." The key issue is controlled optical distribution.

Marine lanterns, especially buoy lanterns, must deal with dynamic sea conditions. A buoy may tilt, roll, pitch, heave, and swing under waves. During storms, large waves, vessel wakes, or strong currents, the lantern’s position and angle may change continuously.

Therefore, a marine lantern must remain visible not only when it is static, but also when the buoy is tilted.

A marine lantern’s optical design should consider at least the following:

• 360° horizontal visibility;
• vertical divergence;
• intensity uniformity across different horizontal angles;
• effective intensity across different vertical angles;
• lens material;
• LED-to-lens matching;
• beam pattern;
• visibility when the buoy is tilted;
• far-field optical performance.

If the beam angle is simply made wider, two problems may occur.

First, the light may be diluted.
If the LED power, lens structure, and optical efficiency are not redesigned accordingly, the luminous intensity in each direction may decrease, reducing the effective range.

Second, the light distribution may become uneven.
Some directions may be very bright, while others may be significantly weaker. Buyers may see only a peak intensity value, but vessels approaching from different directions may experience very different visibility.

Therefore, buyers should not only look at:

Peak luminous intensity.

They should also ask for:

• horizontal intensity distribution;
• vertical intensity distribution;
• beam uniformity;
• effective luminous intensity;
• vertical divergence;
• the exact flash character and duty cycle used during testing.

A real marine navigation lantern should not be judged by the highest brightness at one favourable angle. It should provide a stable, uniform, and recognizable signal across the required viewing range.

4. The lens is not just an appearance component; it is the core optical element

Many buyers focus on the housing and solar panel but overlook the importance of the lens. In fact, the lens is one of the most critical components of a marine lantern.

Different applications require different optical designs. A fixed beacon, floating buoy, port structure, offshore platform, nearshore channel, and long-range warning application may all require different light distribution characteristics.

If the original lens of an aviation obstruction light was designed for fixed obstacle marking, it may not be suitable for 360° marine visibility and vertical angle compensation.

A marine lantern lens should be matched with:

• target range;
• installation height;
• fixed or floating installation;
• IALA flash character;
• LED emitting surface;
• horizontal light distribution;
• vertical light distribution;
• buoy tilt conditions;
• long-term UV and salt-spray exposure.

If the brightness is increased only by raising LED power or changing the controller, without redesigning the lens and optical system, the result may be a narrow beam, insufficient vertical angle, excessive brightness in one area, weak intensity in another, or inconsistent visibility from different directions.

This is why a marine lantern should not be understood as:

a waterproof housing + LEDs + solar panel.

Its real technical foundation is the integrated design of optics, power supply, sealing structure, and marine environmental reliability.

5. IP68 is not just a label; marine waterproofing must begin from the mould and structure

Many aviation light suppliers may claim:

Our product is also IP68.

However, IP68 does not automatically mean suitability for long-term marine AtoN use.

IPX8 generally refers to continuous immersion under conditions agreed between the manufacturer and the user. This means that IPX8 is not one universal fixed test condition. The actual test depth, duration, and method must be clearly understood.

In practice, products with the same IP68 claim may have very different test conditions, such as:

• static water or dynamic water pressure;
• fresh water or salt water;
• 30 minutes, 24 hours, or longer immersion;
• 1 metre depth or deeper immersion;
• normal temperature or post-temperature-cycle testing;
• powered or unpowered condition;
• retesting after salt spray, UV, vibration, or thermal cycling;
• separate testing of cable outlets, lens interfaces, and battery compartments.

For aviation lights installed on buildings or towers, the main environmental challenges are usually rain, dust, UV exposure, temperature variation, and wind load.

For marine lanterns, especially buoy lanterns, the environment is much more complex:

• seawater splash;
• salt-spray corrosion;
• wave impact;
• storm-induced tilt;
• buoy movement;
• long-term moisture intrusion;
• vessel wake impact;
• immersion during transport, installation, or abnormal sea conditions;
• long-term unattended operation.

Therefore, IP68 for a marine lantern should not rely only on post-treatment, sealant, or an added gasket. Reliable waterproofing must be designed from the beginning, including:

• mould structure;
• housing parting lines;
• lens-to-housing interface;
• battery compartment design;
• cable outlet design;
• pressure balance or venting concept;
• fastener position;
• gasket compression;
• solar panel sealing;
• moisture protection for the control board;
• resealing reliability after maintenance.

This is why waterproofing for marine lanterns is not just a “technical adjustment." It is a complete structural design issue.

If a light was not designed for long-term marine conditions from the mould and housing stage, passing a short-term immersion test does not prove that it can reliably operate on a buoy for years.

6. Marine use is not short-term immersion; it is long-term dynamic sea exposure

Some aviation obstruction lights may have good outdoor protection and may even pass short-term immersion testing. But marine lanterns are not used in a one-time test environment. They operate in long-term, dynamic sea conditions.

A buoy lantern may experience:

• long cloudy and rainy periods;
• high-temperature sunlight exposure;
• high-salt atmosphere;
• continuous vibration;
• heavy wave impact;
• significant tilting during storms;
• partial coverage by waves;
• immersion during installation, transport, or abnormal conditions;
• long-term unattended operation.

During storms or heavy seas, buoys may tilt significantly. In this situation, the lantern must not only remain waterproof but also maintain effective optical output while tilted.

This means waterproofing and optics are not separate issues. They are connected.

If water enters the lantern, the battery, controller, LED driver, and communication module may fail.
If the optical distribution is insufficient when the lantern is tilted, vessels may not be able to identify the AtoN signal reliably.
If the lantern consumes too much power under high-duty-cycle flash characters, cloudy-day autonomy may fall below project requirements.
If the lens, gasket, or housing material cannot withstand UV and salt-spray exposure, a short-term test result cannot guarantee long-term service reliability.

A marine lantern must therefore be designed against the full set of marine failure mechanisms, not only a single laboratory test item.

7. Test reports should focus on usable performance, not only peak values

When purchasing marine lanterns, buyers often receive test reports showing maximum intensity, visible range, IP rating, or other data. However, if a report only provides a single peak value without explaining the test conditions, it may not be sufficient for project evaluation.

Professional buyers should pay attention to the following questions:

1. Under which flash character was the luminous intensity tested?
2. What was the duty cycle during testing?
3. Was it peak intensity or effective luminous intensity?
4. Was 360° horizontal intensity distribution provided?
5. Was vertical intensity distribution provided?
6. Was beam uniformity measured?
7. Was autonomy under different brightness modes provided?
8. Was performance tested under both fully charged and low-voltage conditions?
9. Was the product retested after salt spray, temperature cycling, humidity, vibration, or immersion?
10. Does the testing laboratory have relevant capability and credibility?

It is also important to clarify that IALA mainly provides recommendations, guidelines, and technical documents for marine aids to navigation. Buyers should not rely only on a general marketing statement such as “IALA compliant."

Instead, buyers should ask suppliers to explain:

• which IALA recommendations or guidelines are being referenced;
• which parameters were tested;
• under what test conditions;
• whether complete optical data is available;
• whether the product has real marine project experience;
• whether the supplier can calculate range and autonomy under the actual required flash character.

In other words, buyers do not need only a nice compliance statement. They need a technical evidence chain that can withstand review.

8. Why maximum luminous intensity may mislead project selection

Maximum luminous intensity is one of the most easily misunderstood parameters in marine lantern selection.

Some suppliers may advertise:

Maximum luminous intensity: XXX candela.

However, this value may represent only an instantaneous peak under the most favourable condition. It does not necessarily represent the usable intensity during real operation.

For example, a lantern may reach a high peak value under a low duty cycle such as 1:8, at maximum brightness and with a fully charged battery. But if the buyer selects a flash character with a higher duty cycle or longer lighting duration, the actual current consumption, LED heat, and battery load will increase.

To protect the battery and LED, the control system may reduce output. To maintain cloudy-day autonomy, the user may also need to lower the brightness setting. As a result, the real usable range may be lower than the advertised value.

This is especially important for marine lanterns that support multiple IALA flash characters.

Different flash characters do not share the same duty cycle. Some have short lighting duration and low power consumption. Others have longer lighting duration and higher energy demand.

If the supplier only uses the most favourable flash condition to advertise maximum luminous intensity, without explaining effective intensity and autonomy under other flash characters, the buyer may face problems on site:

• the advertised 5NM range may not be achieved;
• some flash characters may not meet the required range;
• cloudy-day autonomy may be insufficient;
• battery degradation may accelerate;
• LED heat may cause unstable brightness;
• there may be insufficient technical evidence for project acceptance.

Therefore, rigorous marine lantern selection should shift the focus from “maximum intensity" to “effective luminous intensity under actual operating conditions."

Buyers should ask:

What is the effective intensity under my required flash character?
What range can it achieve under my required brightness and duty cycle?
What is the autonomy under this operating mode?
Is there supporting test data or calculation basis?

Only then does the luminous intensity data have real project value.

9. Does this mean aviation lights can never be used in marine-related products?

This question should be answered objectively.

It does not mean that aviation light technology has no value for marine product development. LED sources, solar power, controllers, low-power design, and protective materials may be shared across different outdoor safety lights.

However, shared technology does not mean product equivalence.

If a manufacturer starts from an aviation light platform but then completes the following work:

• redesigns a marine-grade housing;
• develops a new mould;
• redesigns the lens;
• verifies horizontal and vertical optical distribution;
• redesigns the sealing structure;
• redesigns the buoy mounting method;
• redesigns the battery and solar power system;
• verifies IALA flash characters;
• tests luminous intensity and autonomy under real operating modes;
• performs salt-spray, immersion, temperature, humidity, and vibration testing;
• provides marine AtoN technical documentation;

then the product is no longer simply an “aviation light modified into a marine lantern." It has become a newly developed marine navigation lantern.

The issue is not whether an aviation light manufacturer is capable of developing marine lights. The issue is:

whether a product has merely been slightly modified and marketed as a marine lantern without true marine AtoN design and verification.

This is what buyers should be careful about.

10. What should buyers confirm before purchasing marine lanterns?

To avoid being misled by similar appearance, vague parameters, or low-cost products, buyers should confirm the following points before purchasing marine lanterns.

1. Was the light designed for marine AtoN applications, or was it modified from an aviation obstruction light?

If it is a modified product, the supplier should explain what marine-specific redesign was completed.

2. Does it support the required IALA flash character?

Buyers should not only ask how many flash modes are supported. They should ask for actual intensity and autonomy under the specified flash character.

3. Does the supplier provide effective intensity, not only peak intensity?

Peak intensity does not represent usable performance across all operating modes.

4. Does the supplier provide horizontal and vertical intensity distribution?

Marine lanterns, especially buoy lanterns, must maintain visibility across different angles and sea conditions.

5. Is vertical divergence clearly specified?

Fixed structures and floating buoys have different vertical divergence requirements. Floating buoys generally need wider vertical divergence to compensate for wave-induced tilt and movement.

6. What are the IP68 test conditions?

Buyers should confirm the test depth, duration, powered or unpowered state, and whether the product was retested after temperature cycling, salt spray, or vibration.

7. Has the product been verified for marine environmental resistance?

This includes salt spray, UV exposure, humidity, temperature cycling, vibration, and long-term outdoor operation.

8. Does the supplier have real marine project experience?

Marine lanterns are safety devices. Field experience and project feedback are important.

9. Can the lantern integrate with AIS, GSM, or satellite communication?

Modern AtoN projects increasingly require remote monitoring and system integration. If the lantern has no data output, communication interface, or expansion capability, maintenance and future upgrades may be limited.

10. Can the supplier provide complete technical documentation?

This includes manuals, installation drawings, optical data, autonomy explanation, test reports, quality documents, and warranty policy.

11. Conclusion: a marine lantern is not simply a flashing aviation light

Aviation obstruction lights and marine navigation lanterns may look similar, but they differ in safety purpose, application logic, optical design, waterproof structure, flash character requirements, test focus, and real operating environment.

Aviation light technology may provide a partial technical foundation, but an aviation obstruction light cannot be considered a marine navigation lantern simply by modifying its appearance, flash rate, beam angle, or waterproof rating.

A proper marine navigation lantern must be designed from the perspective of marine aids to navigation:

• IP68 sealing should begin from the mould and structure;
• optical distribution should be designed through the lens and LED system;
• vertical divergence should consider buoy movement and tilt;
• actual effective intensity should be verified under the required flash character;
• battery and solar power design should match duty cycle and autonomy requirements;
• salt spray, wave impact, and unattended service should be considered;
• AIS, GSM, or satellite communication should be available when system integration is required.

For buyers, the real questions should not be:

Can the light turn on?
Can the light flash?
Does the light have IP68?

The real questions should be:

Can this light provide a stable, verifiable, and maintainable navigation signal under my specified flash character, required range, marine environment, and maintenance interval?

That is the core of marine lantern procurement.

Dexonmarine’s design logic

Dexonmarine marine lanterns are developed for marine AtoN applications from the beginning. They are suitable for floating buoys, fixed structures, ports, waterways, and offshore facilities.

Our design focuses on:

• IALA flash characters;
• marine optical distribution;
• vertical divergence for floating applications;
• IP68 structural sealing;
• long autonomy under cloudy conditions;
• salt-spray and marine environmental resistance;
• Bluetooth configuration;
• GPS synchronization;
• AIS, GSM, and satellite communication expansion;
• remote monitoring and system integration.

Dexonmarine believes that a qualified marine navigation lantern should not only provide attractive peak parameters. It should also explain and verify its real performance under actual marine operating conditions.

If you are selecting lanterns for buoys, waterways, ports, or offshore platforms, we recommend that you do not compare products only by unit price or maximum intensity. Instead, evaluate the full system: optical performance, waterproofing, autonomy, flash character, communication capability, system integration, and long-term maintenance cost.

References / Technical Basis

This article is based on the following technical references and marine AtoN design principles:

1. IALA Recommendation R0110 – Rhythmic Characters of Lights on Aids to Navigation
   This recommendation provides the reference framework for light rhythms used in marine aids to navigation. It supports the point that marine lantern flash characters are not simply general-purpose flashing modes, but part of a navigational signalling system.
2. IALA Guideline G1065 – AtoN Signal Light Beam Vertical Divergence
   This guideline explains the importance of vertical divergence for AtoN signal lights, especially where the light platform may move or tilt, such as floating AtoN applications.
3. IALA Guideline G1116 – Selection of Rhythmic Characters and Synchronisation of Lights for Aids to Navigation
   This guideline relates to the selection and synchronisation of rhythmic characters for AtoN lights, supporting the need to evaluate flash character, recognition, synchronisation, and real operating conditions together.
4. IEC 60529 – Degrees of Protection Provided by Enclosures / IP Code
   IEC 60529 defines IP protection levels. For IPX8, the enclosure is protected against continuous immersion under conditions agreed between the manufacturer and user, and those conditions must be more severe than IPX7. This supports the point that an “IP68" claim should always be reviewed together with the actual test depth, duration, method, and intended use environment.
5. ICAO / Aviation Obstruction Lighting Principles
   Aviation obstruction lights are designed to mark obstacles for aircraft, while marine navigation lanterns are designed to provide navigation signals for vessels. This difference in safety purpose is the foundation for distinguishing aviation obstruction lighting from marine AtoN lighting.