I installed these eBay 40W LEDs the other day on my X6 as Lux are out of stock... Its not too bad in terms of brightness and the colour is good - matching the Xenon HID bulb. In daylight the inner halo is bright enough to be visible, however the bigger outer halo is barely visible. The outer angle loses intensity as soon as you look at it from an angle. Seems like nothing can be done to fix brightness due to headlight design.
I have aftermarket headlights with CCFL halos on my E53 X5 and those things are ultra bright and clearly visible in daylight and keep brightness even from sharp angles. CCFL hint BMW hint.
40W Cree LED eBay link...
http://www.ebay.com/itm/400771325566
(they arrived in Sydney within 2 weeks!)