I put in 4 LEDs in door bottoms but 1 LED flickers a bit... I think it's just the LED itself rather than a power issue. I'd only guess that you have bad LEDs (or the contacts are dirty somehow). If you plug the originals back they turn on fine right? Did you try putting the 1 working one into other slots also - does it work / flicker in that spot?

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'08 X5 3.0si - Alpine White / Saddle Brown interior
Specs: Sport Pkg, Premium Pkg, Tech Pkg, Comfort Access, Aero Kit, Style 433 staggered 20s on Conti DWS
Mods: Carbon 35 tint, LED angel eyes, GP Thunder 7500k fogs, H&R 20mm/25mm spacers, clear reflectors, gunsmoke-tinted taillights
Coded: Digital speedo, windows/sunroof/tailgate close via keyfob

X5 pics at Flickr