[Adrian E]

Originally Posted by IT

Ths history is that Xenons are that much brighter, that pointing them in the right vertical plane seems more important. I'm not sure whether its a regulatatory requirement, or just a nice thing to do, but D2's in the UK have a sensor on the n/s front suspensioon arm and n/s rear suspension arm so that can compute the pitch of the car, and adjust the headlight accordingly so as not to blind anyone.

UN-ECE regulation 98 covers gas discharge headlights themselves and mentions the requirement for ensuring no distraction to oncoming traffic without being prescriptive on how that's achieved

There's a separate reg for headlight washers, which can be fitted for any class of headlight but covers how effective they should be, size of reservoir etc.

From memory (and I never covered lighting in any detail) the requirement for self levelling and headlight washers together for gas discharge headlights is covered by EC Whole Vehicle Type Approval, which will list applicable Directives under EU law and in most instances the identically worded UN-ECE Regulation. The general distinction is that UN-ECE regs usually cover a much wider range of countries for approval purposes.

Think that covers it lol

Adrian