There is still a big a question mark about aftermarket HID kits being road legal in UK and Europe, here is a reply to a question that a buyer asked the hidshop.com (
http://www.hidshop.co.uk/faqs.html)
Are these HID systems road legal? Aftermarket HID systems are not road legal due to the fact you cannot 'E' mark a bulb that is of different type to the bulb it is replacing (ie HID for halogen). Therefore we can only sell these as off road use conversions. Although some hid conversion are legal for example a customers has a car that already has projector cones to control the light, a headlamp washing system and also auto leveling system for the headlight commonly found on new on new cars, if he/she upgrades to a xenon kit then the car has all the requirements for xenon headlamps, honestly if you look some cars they don’t have this yet they are legal such as imported vehicles, example Honda s2000 and Mitsubishi EVO’S from Japan, most Japanese imports which have xenon lights don’t have headlight cleaning system as they are not required in Japan but they still pass the SVA test?
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For brightest unquestionably road legal filament bulbs use Phillips X-treme brightness bulbs, 80% more light for same power input (55watt dip/60watt main).
These have won Auto Express auto-bulb test 2 years in a row. H4 type for GD Jazz are about £23 a pair (don't know what bulb is suitable for GE Jazz).
http://www.powerbulbs.com/product_detail.asp?prod=43