{"id":37548,"date":"2026-09-13T08:00:00","date_gmt":"2026-09-13T07:00:00","guid":{"rendered":"https:\/\/jelproducts.nl\/?p=37548"},"modified":"2026-07-09T21:44:40","modified_gmt":"2026-07-09T20:44:40","slug":"how-sensor-technology-works-in-lighting-systems-at-high-temperatures","status":"publish","type":"blog","link":"https:\/\/jelproducts.nl\/en\/blog\/hoe-werkt-sensortechnologie-in-verlichtingssystemen-bij-hoge-temperaturen\/","title":{"rendered":"How does sensor technology work in lighting systems at high temperatures?"},"content":{"rendered":"

Sensor technology in high-temperature lighting systems works by continuously monitoring the thermal condition of the luminaire and reacting automatically based on that data, for example by dimming or protecting the system. The sensor detects temperature rises before they cause damage to the LED driver or light source. This is crucial in industrial environments where standard lighting simply succumbs to the heat. In this article, we answer the most frequently asked questions about this topic.<\/p>\n

Which sensors are used in industrial lighting systems?<\/h2>\n

Industrial LED luminaires primarily use three types of sensors: NTC thermistors (negative temperature coefficient), PT100\/PT1000 temperature sensors, and thermocouples. Each type has its own area of application, depending on the desired measuring range, required accuracy, and environmental conditions.<\/p>\n

NTC thermistors are the most common choice in LED fixtures. They are inexpensive, compact, and respond quickly to temperature changes. They are typically placed on or close to the LED module or driver to accurately track the operating temperature.<\/p>\n

PT100 and PT1000 sensors offer higher accuracy and are more stable over a wide temperature range. They are used when precision is essential, such as in luminaires operating in environments up to +120\u00b0C. Thermocouples are used less frequently in lighting fixtures, but are indispensable in the most extreme industrial applications.<\/p>\n

In addition to temperature sensors, modern fixtures sometimes also contain motion sensors, light sensors (photodiodes), or humidity sensors. For High-temperature lighting<\/a> however, the thermal sensor is always the core of the system.<\/p>\n

How do high temperatures affect the operation of sensors in luminaires?<\/h2>\n

High ambient temperatures pose a direct threat to the reliability of sensors in LED luminaires. When a sensor operates outside its specified temperature range, measurement accuracy decreases, signals can become distorted, or the sensor can fail completely. This has direct consequences for the protection of the luminaire.<\/p>\n

A practical example: an NTC thermistor designed for a maximum of 85\u00b0C will quickly go beyond its operating range in a steel mill or near a blast furnace. The resistance value then changes non-linearly, making the measurement unreliable. The driver responds to erroneous data and may fail to protect the LED module adequately or in time.<\/p>\n

In addition, heat transfer plays a major role. In fixtures exposed to infrared radiation, such as in steel mills, the sensor can also heat up indirectly due to radiant heat, even if the ambient air is relatively cool. Proper fixture design takes this into account by thermally isolating the sensor from external heat sources and placing it as close as possible to the critical component.<\/p>\n

What is the difference between passive and active thermal protection in LED luminaires?<\/h2>\n

Passive thermal protection relies on the design of the fixture itself to dissipate heat, without using sensors or electronic control. Active thermal protection uses sensors to measure temperature and automatically adjusts based on that, for example by dimming or temporarily turning off the fixture.<\/p>\n

Passive protection: design as foundation<\/h3>\n

Passive protection involves material selection, cooling fins, thermally conductive connections, and the thermal mass of the fixture. A well-designed heatsink can dissipate a large portion of the heat without any electronics. This system is robust and maintenance-free, but offers no flexibility during unexpected temperature peaks.<\/p>\n

Active protection: sensor-driven intelligence<\/h3>\n

Active protection adds an intelligent layer. The sensor continuously measures the temperature of the LED junction or the driver. As soon as a threshold is reached, the system responds automatically. This can be:<\/p>\n