by teK-- » Thu Oct 29, 2009 3:50 pm
I'm referring to HID bulbs fitted into reflector and also projector housings.
Fitment into reflector housings are the absolute worst as there is no control of glare directly into the eyes of incoming traffic. Projector housings prevent the glare because by design they have a sharp vertical cutoff on the beam. That is not to say that the light distribution below the cutoff point is correct though, and when you replace a halogen with a HID the light becomes very bright in the foreground and in the centre of the beam, but it quickly drops off at the sides.
Most people don't notice because they are more concerned with the perception of bright headlights (bright foreground, bright straight ahead), rather than look at how evenly the light is spread out or how wide the light beam is.
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