After trying to accept the OEM ones, trying MTEC Cosmos Blue, Diamond White (both still yellow and less light output than OEM). I went with Xenon Kit, looked brilliant at 6000k but flickered and the cost was around £100 (which I returned).
Can't quite justify LUX price, so went with MTEC CREE LED instead! New for e92. £130!
But after installing, I couldn't be happier. No cable mess and actually brighter than stock. Fully lit inner / outter ring compared to stock and nice white/blue. Matches stock xenon lights colour temperature.
Definitely visible in daylight and no question at night - really striking.
Some angles its still bit funny, but bottom line is, it's brighter and much more defined (especially the outer ring then the halogen, very surprised by that!)
(There are few on ebay but somehow can't put my trust in them. Not that these wouldn't develop fault but I just didn't feel comfortable putting the ebay ones in my car.)