McQuaterX, Yes what you say is my pragmatic approach. If you are so stupid as to ride with lights not meeting the mot regs, then you deserve to get stopped and be asked questions.
The question of UK legality as far as I know really refers to the Vehicle lighting regs as they apply to new vehicles. These are the stringent rules that are passed when you buy a new vehicle. From memory, those rules always specified a lens washer and suspension linked levelling for fitted HID and you don't have those on a bike. But it reminds you to keep your bike headlight clean, because the diffraction from HID on a dirty lens is a bigger problem. The KRS headlight is in a different category to dip beam lights. It's described as 'Steep side cutoff' or something like that. Basically it means the dip beam is straight ahead with left and right cuts, which work because they put effort into the reflector design.
From what I could discover, the UK MOT rules are a slimmed down version of the oem builders regs which say lights must not blind and give the correct pattern. I don't think the average MOT tester could tell the difference between 6K and 4K lamps, he's only interested in the pattern on the board.
Just for interest, you see a lot of Hardleys in UK with PIAA auxiliaries fitted. When I waded through the regs it would seem impossible to fit these legally, since auxiliary lights for bikes can only be a few inches away from the main. That makes the GS OK.
My pragmatic approach is to get aim and coverage legal, don't annoy oncoming, use HID main sparingly and hope that the rule makers will one day recognise that bike fatalities can be reduced by the greater visibility which HID gives at the higher color temperatures.
PS, you can have any light fixed to your helmet or clothing powered from its own power source. It's legal because it's not a 'part of the vehicle'. I have a rear flashing cycle led I can push into a loop I stitched on the collar of my riding jacket. I use it in mist, fog, or quiet unlit roads late at night. You can see it for miles. You can switch it off for times when you don't want or need the visibility.
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