The light is on, but the road is too dark.
Learning Track · Module 7: Failure library · Step 55 of 101
| Symptom | Residents report a dark street. The light works. Lux readings are low. |
|---|---|
| Cause | Dust, soot, and insects on the cover. Polycarbonate covers can yellow in strong UV. |
| Check | Measure lux before and after you clean one luminaire. |
| Fix | Clean the cover. Replace yellowed covers. |
| Prevent | Specify flat glass. Plan cleaning by the dust level of each area. |
Sources
- IEC 60364-6 Verification of low-voltage installations
- IEC 61643-11 Surge protective devices
- IEC 60598-2-3 Luminaires for road and street lighting
- Maker installation and maintenance instructions
Changes: 30 October 2026: First publication: guides for Europe, the Middle East, South Asia, and the USA; failure library; tender clause library; comparisons; tools; downloads. See the changelog. Found a mistake? Report it.