I have seen people swap the bulbs out for LED's in the mirror puddle lights but I like this style much better and it throws much more light as well.




These are common and all over plus fit other car brands too like Volvo. About $15 a pair.

Mirror Puddle Lights

Now I found a great thread on installing these little guys and it took a bit of fiddling to release the tab on the stock light but in the end it was simple and quick after you mess with it a bit!

Here is the thread;
Remove Puddle Lamp Instructions

Attached is a bit from the workshop manual as a picture is worth a thousand words. There is a small access window at the bottom of the mirror if you tilt the glass up and back so you can see it. Read the directions in the above thread and I purchase and used the great little tool called a chip lifter to release the tab and get the stock lights out.

It's a Wiha 26810 - Chip Lifter. A little screw driver looking tool with the perfect curved end to get in and release the light tab.



It's under $10 and can be found everywhere on EBay and Amazon.

So the entire project was right at $25 cheap when your in the Jaguar world for sure!!
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I purchased a set of those about a year ago. They are a thousand times better than the OEM puddle lights!

 

anyone find these in blue anywhere