Does your breath stink when you talk out your butt?Originally Posted by manorness7
The biggest problem is glare and blinding oncoming traffic, the reflector is designed for use with Halogen and not Xenon and you end up with a lot of scatter as the diagram below demonstrates. You could have a light source that measures 10,000 lumens but it would be useless because of poor reflector design, to utilise Xenon correctly you need to use a projector lense hence why every car on the market with an OEM Xenon / Bi-Xenon option uses projectors.
With much of the light being scattered the performance of Xenon’s is generally nowhere as good as that of Halogens, the improvement that is seen is a lot more light in front of the car but a lot less in the distance on the road where you need it. Daniel Stern sums this up well “It’s tricky to judge headlamp beam performance without a lot of knowledge, a lot of training and a lot of special equipment, because subjective perceptions are very misleading. Having a lot of strong light in the foreground, that is on the road close to the car and out to the sides, is very comforting and reliably produces a strong impression of “good headlights”. The problem is that not only is foreground lighting of decidedly secondary importance when travelling much above 30 mph, but having a very strong pool of light close to the car causes your pupils to close down, worsening your distance vision…all the while giving you this false sense of security. This is to say nothing of the massive amounts of glare to other road users and backdazzle to you, the driver, that results from these “retrofits”.”