The Insurance Institute for Highway Safety, well known for crash testing cars to see how well they protect people in an accident, tested the performance of 82 headlights on 31 different cars.
The reports were dismal. Only one car tested was rated "Good." And that was just with LED headlights. The Prius equipped with headlights passed the test with a Good rating, when it was equipped with LED lights and high beam assist. The other 30 cars failed, and the Prius also failed when equipped with Halogen lights.
LED lights do better on the tests than Halogen lights in general.
The IIHS thinks that headlights shoot illuminate at least 330 feet straight ahead. Motorists going at least 60 mph might not have enough light to see hazards in time to stop.
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