Has anyone fitted a LED replacement for the P21W reversing lights?

I see on eBay they are now doing single CREE LED lights rather than those multi LED lights. I think a couple of my headtorches use CREE and they are very bright.

Thanks
Simon

LED "bulbs" work very poorly in reflector bowls designed for filament lamps.

I recently bought some multi ones as a replacement for my Lotus but they don't power up properly.
I can pop a couple in the post if you want to test. 2008 FL2 TD4 XS Zermatt Silver, Manual
2010 Jaguar XF

Chris, that would be kind of you. It would be good to try them to see if there is any improvement.

Thanks
Simon