Andy I've got cree bulbs in the reversing light and front fogs on the old Git
(which I'm running as DRL's) the fog's throw up a bulb warning in the fog lights which is a minor nuisance
. Got mine from car mod shop, off ebay.
Also have them in the Benz as reversing lights - nice and bright and a big improvement. I would imagine you can get even brighter ones these days, mine are 2 yrs old