@mcbee - hey, it's a good point and I agree with you in principle, I see terrible riding by loads of bikers and cyclists all the time - especially in London, filtering without considering that they (asides from pedestrians in the road) are the most vulnerable road users going. Bike/Motorbike vs car - of course I'll take any bets on who comes out of that argument better off. As a cyclist myself, I'm pretty paranoid about how I ride on the road, and will follow the rules, being visible and making sure it's blatantly obvious where I'm going and what I'm about to do - I've seen too many 'offs' to risk life and limb.
That said I can kind-of see XGE's point too, only so far as I'd want to avoid any accident, regardless of the fault - ok, so the other party losing a limb through their own stupidity is a bit of a bummer, but the scratches/dents on your lovely car make you feel bad, the potential for protracted legal to-ing and fro-ing makes you feel even worse. Personally I don't think XGE is going the right way about it, I just thought I'd answer the query about the light sensor.
@XGE - just my two pence worth - my advice would be don't change lane if you are in any doubt as to how safe it is - mmm-five makes a valid point in his response to you (2nd post from the top). bypassing the auto-dimming function will only mean you'll see a brighter light - how are you going to know how far behind you it is without giving it the same attention as you'd have to do anyway to conduct a safe lane-change?
Liverpool
