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I , some while ago, submitted a posting (sticky) on this forum in respect of the legality of upgrading to HID lights from Halogen. In a nutshell , if the original fitting is halogen they are not legally upgradeable to HID and can therefore be failed on MOT. Regards, John Not for me to say you should not do it, that is obviously your choice.

Noted re the 100W bulbs, I pulled a set of these out of a TD5 Disco I have that were working fine, so wonder if this was something you could do, but the design is quite different with a glass reflector not plastic, so I won't risk using something similar in the jag based on your advice. Unfortunately your links didn't really work, so I can't see the pics you refer to. I'd go to the webpage, grab the whole url and embed using the link feature which is accessed using the little chainlink icon 4th along from the left etc. Or just paste the whole link in without the brackets and additions etc: https://www.jaguarownersclub.com/forums/topic/25348-s-type-headlights-convert-to-hid/#comment-83490

You are 100% right Dave, my auto electrician said that LED was (generally) a waste due to cheap LED quality making LED conversions potentially worse lighting than the standard set up. So if you have knowledge of better quality bulbs, and will try them in the S-Type, all good! I await how you get on with interest, or if I get to it before you I may give these LEDs a go! Or try some 100W H7s as an interim measure. Thanks for raising (and potentially solving 😆!) the issue, most interesting! 👍😀

Hey Dave, I'm in the process of recommissioning my S-Type (yay! 🥳) and have just had my electrics diagnosed and repaired which I thought was a good start! Like you, I have the earlier X200 and I am / was disappointed in the dipped beam performance. On one of her last night time trips back from Brighton on the A27, it was excruciating being dazzled by 4x4s and anyone running LED lights it seemed. With the full beam on, not so bad, but on dipped beam approaching traffic, not a good thing at all! In the arms race that modern car headlights seemed to be, I felt I was very much on the losing end! I asked my autoelectrician (a very capable guy) what he thought of LED conversion and he wasn't keen, suggesting Osram Nightbreakers, which incidentally, I was already using! 😆! The Nightbreakers are only 55W, so I wondered if more powerful versions are available? Or if 100W bulbs from another manufacturer could be an option? I follow this post with interest and hope there is a viable solution out there, ideally one that doesn't involve wholesale replacement of the complete headlamp units from a later car, or something equally drastic (and expensive!) 🤞