Interesting comments thanks for that. I went in Halfords and they seem to do brighter bulbs for £22 each which seems a lot.
But looking some more I found this which maybe makes me think that I need a proper HID kit and not a fake bulb?
Also not sure about self levelling as I don't want to dazzle other drivers, maybe have to think about it!
"Blue" Headlights
But what of other blue headlights? The aftermarket is absolutely teeming with blue headlight bulbs today. Most of them are HID headlight emulators. These "cool blue" fake HID lights are merely tungsten-halogen bulbs with a blue tint added, producing a bluish headlight. Unfortunately, blue is the shortest light wavelength. Consequently, this blue light dissipates quickly, producing more glare from fog, rain, and snow. For this and other reasons, non-white headlights are illegal for road use in the U.S., Canada, and many other countries. There is however another, legal, version of the "blue" headlight bulb. This one has a gold color on its glass. The coloring is not a tint but a special color filter, which blocks the yellow in the bulb's light, producing a whiter output. The reduction of the halogen's yellow output brings as a byproduct a slightly blue cast, just as the yellow's inherent absence in the HID headlight makes its color slightly blue. However, the two systems get their blue byproduct from different sources, and unlike the HID, the overall light from this &qiot;ultra-white&qiot; tungsten-halogen bulb is sharply reduced. The major color in the incandescent headlight’s light remember is yellow. Therefore, with the yellow spectrum blocked, less light reaches the road. These lower-output bulbs are, surprisingly, legal because they conform to the government regulations specifying white light. Unfortunately, the light they output is actually less bright than that from standard tungsten-halogen headlights.
"Xenon" Headlights
To further confuse the issue, some companies are advertising "Xenon" headlight bulbs. These aren't anything special. They are merely tungsten-halogen bulbs that have xenon added to their halogen gas. Xenon is the best gas to have inside an incandescent bulb. It has larger atoms that are better at bouncing evaporated tungsten atoms back onto the filament, with the result significantly improved bulb life. However, this is not a special bulb at all, as all of the newest tungsten-halogen bulbs are made to this specification, not just a few company’s offerings. Even more of a problem is the confusion that results from the use of the word "Xenon" for different kinds of headlight bulbs. Late model (H7) tungsten-halogen bulbs are mistakenly called Xenon, as are also HIDs, even though that is not the correct name for either of them, and they are completely different bulbs. One has a filament and the other doesn't.
