Good lighting significantly reduces the risk of occupational accidents in hot work environments, because employees spot hazards faster and can react better. In environments with high temperatures, people are already under extra physical stress, making impaired vision due to poor lighting a direct safety risk. In this article, we answer the most frequently asked questions about lighting, heat, and safety on the workplace.
What risks does poor lighting increase in hot working environments?
Poor lighting in hot work environments increases the risk of tripping, mishandling materials, and missing hazard signals. Combined with heat stress, which already diminishes employees' concentration and reaction speed, the effect of insufficient visibility becomes extra hazardous. The combination of both factors demonstrably leads to more incidents.
In practice, we see that hot environments such as steel mills, foundries, and production halls with high process temperatures are also visually challenging. Heat causes air to vibrate, making the outlines of objects and people less sharply visible. At the same time, hot processes such as melting furnaces or foundries produce intense light sources that can cause glare if the ambient lighting is inadequately adjusted.
Some specific risks that poor lighting increases in hot environments:
- Reduced visibility of obstacles and walkways
- Insufficient contrast when reading meters, switches and safety signage
- Glare caused by uncontrolled light sources, which causes night blindness
- Worse recognition of colleagues and moving machinery
- Delayed emergency response due to lack of overview
Especially in environments where employees are already under extra stress from heat, good lighting in heavy industry not a luxury but a basic requirement for safe work.
How does heat affect the performance of standard lighting fixtures?
Standard industrial lighting fixtures are typically designed for ambient temperatures up to about 40 to 50 degrees Celsius. Above that threshold, the light output decreases, the lifespan of the LED components is shortened, and the fixture can fail completely. In hot environments such as steel mills or foundries, that is a serious problem.
The core of the problem lies in thermal management. LED lighting also produces heat itself, which is dissipated via the fixture housing. If the ambient temperature is already high, this heat dissipation is less effective. The result is thermal overload of the LED driver and the light source itself. This manifests as:
- Reduced light output, also known as “lumen depreciation”
- Color shift, which makes the light provide less contrast
- Reduced luminaire lifespan
- Unexpected downtime, precisely at times when continuity is most needed
On top of that, in some environments there is also infrared radiation from hot processes, such as liquid steel or melting furnaces. That radiant heat stresses luminaires in a way that a standard temperature test does not simulate. A luminaire that looks suitable on paper can still fail in practice.
What are the lighting standards in industrial work environments with heat?
For industrial work environments, lighting standards from the NEN-EN 12464 series apply, which prescribe minimum illuminance levels per type of workstation and task. The more precise the work, the higher the required illuminance level. For environments with extreme temperatures, requirements also apply to the IP rating and thermal resistance of luminaires.
The IP rating (Ingress Protection) indicates how well a luminaire is protected against dust and moisture. In hot, industrial environments, a high IP rating is important because dust and condensation pose extra risks during temperature fluctuations. In addition to IP ratings, IK ratings are also relevant for specific situations, which indicate mechanical impact resistance.
ATEX directives apply to potentially explosive zones, such as environments with flammable gases or dust. In such cases, lighting must be explicitly certified for the hazardous area in question. More about the meaning of IP and IK ratings helps in assessing which luminaire is suitable for a specific environment.
Which lighting properties reduce the risk of work accidents in the heat?
Lighting that contributes to safety in hot working environments combines sufficient illuminance, good color rendering, minimal glare, and thermal reliability. None of these properties stand alone: they reinforce each other and together they determine whether employees can work safely.
Color rendering deserves special attention. A high CRI (Color Rendering Index) ensures that colors are displayed realistically. This is not only pleasant, but also functional: distinguishing between a hot and a cold pipe, or recognizing safety colors on machinery, becomes easier with a higher CRI. In hot environments where visual information is already more difficult to process, this makes a noticeable difference.
Glare is another critical point. Luminaires with non-glare optics, also known as full-cutoff technology, ensure that the light is directed toward the work floor without employees looking directly into the light source. That is essential in environments where people are already visually strained by hot processes. More about High-temperature lighting show which technical choices are required for that.
Where should lighting be placed in a hot industrial environment?
In hot industrial environments, lighting must be positioned so that it evenly illuminates workstations, walkways, and hazardous zones, without the fixtures themselves being exposed to direct radiant heat from hot processes. Placement requires a careful balance between light coverage and the thermal load on the fixture.
In practice, this means that luminaires should preferably not be mounted directly above open furnaces, melting points, or other hot processes. Where that is unavoidable, specially designed heat-resistant luminaires are necessary. Walkways and evacuation routes always deserve priority in the lighting plan, so that the route remains clearly visible even in emergency situations.
Height also plays a role. Fixtures mounted too high provide less usable light at working height, but fixtures mounted too low can be damaged by process activities or mechanical impact. A good balance, supported by a professional lighting plan, prevents both problems.
What is the difference between heat-resistant and standard industrial LED fixtures?
Heat-resistant LED luminaires are specifically designed to function at ambient temperatures that would damage or cause standard luminaires to fail. The difference lies in the choice of materials, the thermal architecture of the luminaire, and the quality of internal components such as drivers and LED modules.
Standard industrial LED fixtures are suitable for normal industrial conditions, but fail with sustained exposure to extreme heat or infrared radiation. Heat-resistant fixtures use, among other things, high-grade aluminum alloys for better heat dissipation, specially selected drivers that can withstand high temperatures, and housings that can also handle thermal shocks during rapid temperature changes.
A concrete example: the Orca HT and Barracuda HT floodlights from JEL Products are designed for environments up to 120 degrees Celsius and resistant to direct infrared radiation. That is a fundamentally different design than a standard LED fixture with an IP65 rating. Choosing the right type of fixture directly impacts business continuity and safety.
Practical example: Tata Steel IJmuiden
Tata Steel IJmuiden wanted to become more sustainable, and that also applied to the lighting near the production process. Close to the hot steel, the temperature rises to +120 °C, the steel emits infrared radiation and the composition of the air is aggressive. During the inventory, it became clear that the lighting could also be better in a number of places; extra light was added there, location by location. JEL provided the lighting design and engineering, designed the installation and supplied Snapper HT, Barracuda HT and Orca HT, chosen per location. Near the working area, 100 lux is achieved, with a uniformity of up to 0.55.
For safety in hot zones, that extra light is the key point. Replacing luminaire for luminaire makes an installation more efficient, but leaves dark spots where they already were. Around hot material flows in particular, employees need to see obstacles, hot surfaces and moving equipment in time. It also matters that the light holds up: a luminaire whose light output drops, or which fails, due to heat and radiation creates a shortage of light exactly where the risk is greatest.
Read more about the Tata Steel IJmuiden project
How JEL Products helps provide relief in hot work environments
JEL Products supports industrial organizations in achieving safe, reliable lighting in environments where standard solutions fall short. That does not start with choosing a fixture, but with understanding the environment and the specific challenges involved.
Specifically, JEL Products offers:
- Custom lighting advice, tailored to the temperature conditions, process activities, and safety requirements of the specific location
- High-temperature resistant LED fixtures like the Orca HT and Barracuda HT, designed for environments up to 120 degrees Celsius
- Complete project management from engineering and lighting design to installation and commissioning
- Lighting for the site areas outside ATEX zones, with referral to a certified Ex manufacturer for the zones themselves
- ISO 9001 and VCA** certified working method, ensuring safety is guaranteed even during execution
Do you work in an environment where heat, continuity, and safety come together? Then please contact us via the JEL Products Contact Page for a no-obligation consultation about the possibilities.