Hella Light and Rain Sensor
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Hella Light and Rain Sensors: Multi-Function OE Technology
When it comes to light and rain sensors, few names carry the same weight as Hella. As a global tier-one supplier with decades of original equipment experience, Hella didn't just manufacture sensors for automakers — it helped define what a modern light and rain sensor could do. The result is a product line engineered with the same precision and intelligence found on the assembly line, now available as a direct replacement for the independent aftermarket.
What Makes Hella's Rain/Light Sensors Different
Hella set a new standard with the introduction of the first combination sensor and has maintained its position as market leader for more than 20 years thanks to its high quality standards. That leadership started with a fundamental rethinking of what the sensor should accomplish.
Hella's rain/light/climate sensor features combined sensor control functions such as automatic windshield wipers, optimized lighting, and air conditioning based on evaluation of solar loads and humidity in the vehicle, and also comes with a function to improve the visibility of the head-up display (HUD). In practical terms, this means a single compact module handles tasks that once required multiple components.
Hella has broken boundaries in the automotive market by offering the first five-function combination sensor. The rain/light/climate sensor module is one of the smallest sensors of its type on the market and features a flexible, modular design. It combines five functions: rain, light, solar load, humidity, and visibility of the head-up display.
The Technology Behind the Sensor
The rain sensor detects precipitation on the windshield using an optoelectronic method of measurement. The sensor element comprises one or more light emitting diodes (transmitters), a prism, and a photodiode (receiver). A light beam produced by the light emitting diode passes via a prism to the windshield, is reflected several times by the outer windshield surface, and forwarded to the photodiode. The evaluation electronics use the irradiance to calculate the amount of rain currently on the windshield and transmit the information needed to control the wiper speed. The sensor continually takes measurements so that wiping can be individually adapted to the amount of precipitation.
On the lighting side, the light sensor works with two independent sensors: one has a wide angle of detection so that it captures all ambient light regardless of the angle of incidence. The second sensor measures the road surface light, aligned to detect the light intensity directly in front of the vehicle. The automatic brightness adjustment of a head-up display is based on this measurement method, while automatic activation of the low beam is based on data from both sensors.
Broad Vehicle Coverage — Including Steep-Windscreen Applications
Hella is currently the only supplier offering a combined rain-light sensor for steep windscreens (windscreen inclination of 80° to 90°) — ideal for vehicles such as buses/coaches, agricultural machinery, construction machinery, or motor homes, as the requirements differ from vehicles with flat windscreens. Two independently operating front and ambient light diodes enable reliable differentiation between driving over bridges or through tunnels: when the vehicle traverses a bridge, the low beam is not switched on; when it drives through a tunnel, the low beam comes on automatically.
A Key Component of Modern ADAS
As an electronics expert with original equipment and diagnostic expertise, Hella offers a broad product portfolio in the independent aftermarket — including for the important area of advanced driver assistance systems (ADAS). Hella has three highlights in its portfolio that are essential for ADAS: the 24 GHz rear radar sensor, the parking aid with ultrasonic sensors, and the rain/light sensor. Replacing a failed sensor with a genuine Hella unit ensures seamless reintegration with these safety-critical systems, restoring the vehicle to its original performance specification.
Browse the full selection of light and rain sensors or explore the complete Hella catalog to find the right OE-grade sensor for your application.