Testkriterien
Light output
- Light distribution is measured in the laboratory and illustrated under real-world conditions. The mounting height is 2.5 m with a tilt of –15°.
- The results of an H3 work light and a no-name LED work light are shown for subjective comparison. Light output is evaluated in lumens per watt.
Color rendering
- The color rendering of work lights is measured under standardized laboratory conditions. Studies show that a natural, daylight-like color rendering significantly improves the sense of safety during night operations and reduces driver fatigue.
- When interpreting the color rendering index (CRI), note that the reference value of 100% corresponds to the light spectrum of a halogen lamp. The lower the CRI value, the greater the deviation from the natural halogen light spectrum.
Color temperature
- Alongside color rendering, color temperature is an important parameter for assessing the naturalness of a light source. The further the value deviates from 5000 K, the less natural the light appears.
- Testing is based on the requirements of UN-ECE R46. The work light must comply with the tolerance range defined in this standard. Any unusual laboratory results are verified in a practical test setup and documented in the test report.
Vibration and shock resistance
- Mechanical loads are tested according to ISO 16750-3.
- For vibration resistance, the test cycle “Passenger car, sprung masses (body)” is the minimum requirement. If the cycle “Commercial vehicle, decoupled cab” is also met, this is rated as good.
- For shock resistance, the test cycle “Rigidly mounted parts” is the basic requirement. If the cycle “Parts in doors and flaps” is also met, this is rated as good.
- No mechanical damage may occur in any test cycle.
Ingress protection (IP Rating)
- Ingress protection is assessed based on manufacturer-provided test reports. The test item, including all connectors, must meet at least IP67 requirements, meaning the housing is dust-tight and protected against temporary immersion.
- If protection against continuous immersion (IP68) is achieved, this is rated as good.
- If all components also meet the requirements for high-pressure cleaning (IP69), this is rated as very good.
Electromagnetic compatibility (EMC)
- All work lights must meet at least the requirements of UN-ECE R10. If they also achieve EMC Class 5 (CISPR 25), this is rated as good.
- Class 5 compliance is particularly advantageous for modern machinery, as it helps prevent interference with the tractor’s onboard electronics.
Handling and operation
- Reverse polarity protection is tested in the laboratory by connecting the work light to the maximum input voltage with reversed polarity for one minute at 25 °C. No damage may occur.
- Surface temperature is measured using a thermal imaging camera at 25 °C to ensure protection against burns. According to DIN EN ISO 13732-1, the maximum housing temperature must not exceed 70 °C. A temperature below 55 °C is rated as good, and below 44 °C as very good.