Whether the light comes from a halogen or high-intensity-discharge bulb or LEDs, the design of the headlight assembly and the reflectors — the parts that shine the light down the road — also affects performance, along with how well the headlights are aimed. The Insurance Institute for Highway Safety rates headlights based on the distance that they illuminate the road as a vehicle travels straight and on curves. IIHS says that on a straight road, low-beam headlights rated good (the top rating) illuminate the right side of the road at least 325 feet. Headlights rated poor (the lowest) light 220 feet or less. IIHS says LEDs generally perform better in its tests, but the organization has rated some halogen headlights higher than some LEDs. Some halogens have been rated acceptable (the second-highest), and some LED headlights as marginal (second-lowest) and even poor. However, only LEDs have earned good ratings.
Unlike halogen or HID bulbs that will simply stop working or burn up, LED headlights react or degrade in a certain way. As the diodes or the circuitry burn up, the maximum brightness of the LED bulb will tend to get lower. They will still light up, but the light output will be dimmer than usual.
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