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What's a normal failure rate for LED street lights after 3 years?

2026-07-08

For a properly designed LED street light with a quality driver installed in a typical outdoor environment, you should see a field failure rate under 1% after three years. If it's significantly above that, something is wrong — probably one of:

- Driver failures: The most common cause. Look for capacitor swelling on failed units — it indicates either a surge event exceeded the driver's protection rating, or the driver is running hotter than designed.
- Water ingress: Failed gaskets or breather valves. If multiple fixtures in the same area fail, look at the prevailing wind direction — wind-driven rain hits from a consistent angle and will find any sealing weakness.
- Surge damage: If failures cluster by electrical phase or after thunderstorms, your surge protection is undersized for the location. Upgrade to 10 kV or add external SPDs at the pole base.

A 0.5–1% annual failure rate is normal and expected — that's why municipalities order spares. A 5%+ failure rate inside three years means a design or component problem. If you're seeing that, collect the failed units, photograph the internals, and request a root cause analysis from the supplier. A good supplier will want to know as much as you do — field failures are expensive for both sides, and finding the root cause prevents the same failure in future production batches.

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