How do you illuminate a heat-tracing system or tunnel in an industrial environment?

A heat-welding or industrial tunnel is illuminated with LED fixtures designed specifically for high temperatures, infrared radiation, and limited ventilation. Standard fixtures are not suitable for this application: the heat damages the electronics, drastically shortens their lifespan, and increases the risk of failure. For steel mills, ovens, and similar environments, fixtures with a temperature resistance of at least +80°C to +120°C are required, combined with the appropriate IP rating and a robust housing. This article answers the most frequently asked questions about lighting in extreme industrial environments.

What conditions make lighting in a heat-insulated structure so difficult?

Heat domes and industrial tunnels combine several factors that make lighting extremely demanding: high ambient temperatures, intense infrared radiation from glowing material, dust, vibrations, and barely any ventilation. Standard LED fixtures are designed for environments up to approximately +40°C. Above that temperature, the electronics degrade quickly, light output decreases, and the risk of fire-hazardous malfunctions increases.

In a steel factory or foundry, there are additional challenges to contend with. Metal spatter, aggressive fumes, and extreme radiant heat from liquid steel or hot slag create an environment that literally breaks apart fixtures. Even the housing of a fixture must withstand thermal shocks: rapid temperature changes that cause materials to expand and contract.

Tunnels in industrial environments also face specific problems with light output and accessibility. Fixtures are often installed in hard-to-reach locations, which means outages have immediate consequences for the safety of employees and the continuity of the production process.

Which type of LED fixture is suitable for extreme heat?

Specially developed for lighting in heat-wave and high-temperature environments high temperature fixtures required, with a minimum ambient temperature tolerance of +80°C to +120°C. These luminaires differ in several technical aspects from standard industrial lighting.

Important characteristics of suitable fixtures for extreme heat are:

High temperature resistance: suitable for ambient temperatures up to +120°C, including exposure to infrared radiation
Rugged casing Cast aluminum or stainless steel that is resistant to thermal shocks and metal splinters
Optimized thermal management: passive cooling through the design of the housing, without the need for ventilation
High IP class: Minimum IP65 or higher to keep out dust and splash water
Shock resistance High IK rating for environments with vibrations from machines or vehicles
Heat-resistant cable entries and connections: so that the electrical connections do not fail as well

Lighting fixtures such as Orca Barracuda floodlights are specifically designed for this kind of environment and have been tested for prolonged exposure to the extreme conditions found in steel mills and similar industrial environments.

What are the standards and certifications for lighting in hazardous industrial zones?

In zones where there is an explosion hazard, ATEX certification is mandatory for all electrical equipment, including lighting. ATEX stands for “ATmosphères EXplosibles” and defines the requirements for equipment in environments with flammable gases, vapors, or dust clouds. Without the correct ATEX classification, lighting in such zones may not be legally permitted.

In addition to ATEX, the IP class (ingress protection) and IK class (impact resistance) are also relevant in industrial environments. The IP class indicates how well a luminaire is protected against dust and moisture, while the IK class describes the mechanical impact resistance. In a heat enclosure or tunnel, an IP65 or higher rating is usually the minimum, depending on the specific conditions.

For environments with extreme corrosion, such as chemical installations or offshore applications, additional requirements apply to the material of the housing. Stainless steel luminaires offer the most resistance in this regard. It is advisable to always check when selecting luminaires which zone classification applies to the specific location, so that the chosen lighting is fully compliant.

How do you calculate the correct light intensity for a heat jacket or tunnel?

The required light intensity in a heat-tracing or industrial tunnel depends on the tasks performed, the geometry of the space, and the reflectance values of walls and floors. As a guideline, a minimum illumination intensity of 200 to 500 lux at working level applies in industrial work environments, depending on the accuracy of the tasks to be performed.

A good lighting calculation proceeds in a step-by-step manner:

Determine the spatial parameters: length, width, height and the position of the mounting locations
Determine the required lighting intensity: based on the activities and applicable standards for the sector
Take maintenance costs into account: fixtures provide less light over time; the calculation must compensate for this
Use light simulation programs: Software such as Dialux or Relux makes a precise spread visible
Check for glare: in tunnels and vaults, the direction of view of employees determines the placement of fixtures

In heat domes, the degradation of fixtures due to heat also plays a role in the calculation. A fixture that operates at its maximum temperature limit usually produces less light than its nominal value. Professionally Custom lighting advice In this kind of environment, it is also not an unnecessary luxury, but a necessary step.

How do you maintain lighting in hard-to-reach areas in an industrial environment?

Lighting in heat chambers and tunnels is rarely easily accessible. This makes maintenance time-consuming, expensive, and sometimes dangerous. The smartest approach is therefore to minimize maintenance requirements by choosing fixtures with long lifespans and high reliability.

Practical considerations for maintenance in hard-to-reach environments:

Choose fixtures with an L80 lifetime of at least 50,000 hours, so that replacement intervals are far apart
Plan maintenance along with planned outages or shutdowns of the installation
Use fixtures with replaceable components so that the entire fixture does not have to be replaced.
Document the installation positions and technical specifications accurately for future maintenance
Consider remote monitoring if the environment allows, so that outages are detected early.

In environments with continuous production, such as steel mills that operate 24/7, unplanned outages for lighting are simply not an option. Robustness and long lifespan are not additional benefits here, but absolute requirements.

When do you choose a total solution instead of individual fixtures?

Individual luminaires are a logical choice if you want to complement or replace an existing installation with a comparable product. But as soon as it comes to a new project, a major renovation, or an environment with complex technical requirements, a total solution is almost always the better choice.

A total solution includes not only the luminaires themselves, but also the lighting design, the engineering of the installation locations, any masts or supporting structures, the installation and commissioning, and agreements on maintenance. This prevents individual components from not connecting to each other, the lighting calculation from not matching reality, or the installation from not meeting the applicable safety requirements.

For heat wave and industrial tunnels, the complexity is usually high enough to justify a total approach. The combination of extreme conditions, specific standards and difficult accessibility makes bespoke solutions necessary. A party that guides the entire process, from design to delivery, minimizes risks and ensures an installation that works immediately.

Practical example: Farm Frites

Farm Frites faced LED lighting that failed repeatedly in the drying tunnels and production ovens. The previously chosen fixtures were not able to withstand the high thermal stress and the intensive cleaning routine. The lighting design for the drying tunnels, production ovens and friet tunnels, the engineering of a custom-made fixture and the design of the installation were all handled by Farm Frites. That involved a special feed design for the stainless steel, IP69K with borosilicate glass and a protection rating, Snapper HT with a thermal design that is adapted to -40 °C to +70 °C in the friet tunnels. JEL 78 fixtures were supplied; in the oven, 200 to 500 lux are achieved.

A tunnel or oven is a confined space in which a fixture has little opportunity to dissipate heat, and where replacement can often only be performed when the line is stopped. Borosilicate glass is resistant to strong temperature fluctuations and does not break upon thermal shock, which matters once a warm fixture is cleaned. In such spaces, the choice of housing, glass, and seal are therefore just as crucial as the light output.

How JEL Products heat-tracing and tunnel lighting help

JEL Products supports organizations in the heavy industry in realizing reliable lighting in the most demanding environments. That starts with a thorough analysis of the specific situation and ends only when the installation functions properly.

What JEL Products specifically offers for heat domes and industrial tunnels:

Selection of fixtures that have been tested and proven in high-temperature environments, including the Orca HT and HT Barracuda floodlights
Professional lighting calculations tailored to the geometry and activities in the space
Engineering of the installation locations, including support structures and assembly solutions in difficult-to-reach locations
Guidance on installation and commissioning by certified technicians (ISO9001 and VCA**)
Advice on maintenance planning to maximize the lifespan of the installation
Lighting for the areas outside the ATEX zones, with referral to a certified Ex manufacturer for the zones themselves

Whether it’s a steel plant, a foundry, a chemical plant or any other environment with extreme requirements: JEL Products we’ll work with you from the initial consultation to the completion of the project. Contact us via the contact page and present your situation to a specialist.

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How do you illuminate a heat-tracing or tunnel in an industrial environment?