It's funny how HID threads always end up like this.
Regarding 'bay' HID kits, a bulb is a bulb (though some may be brighter than others), the pattern produced will be the same as thats down to the reflector / projector used. But, the difference is in the ballasts, some very cheap kits use Analog ballasts, the higher quality ones (like hids4u use) are 100% electronic. Electronic ballasts are much better at controlling the arc / start up.. and I assume could give better life from your HID bulb.
I think a lot of the problem in this thread is some strange phenomenon called 'HID snobbery', those with expensive motors that they paid silly money for Xenon factory fit options don't like cheaper cars retrofitting for £29.99, it's not fair
.....hence calling them 'chavs'. If you paid £750 for your factory upgrade then you quite clearly have more money than sense (ie - not a chav lol)
Legalitys aside..Washers / Self leveling motors... it's not really important in the grand scheme of things (hell I don't have auto leveling on my bike, when I throttle on the beam probably blinds), but I do agree old reflectors shouldn't be fitted to as they do glare a silly amount. It's just being courtious to other road users..
Newer reflectors handle the extra light a lot better..
/opens HUGE can of worms to replace small one and leaves thread