I just got these "Yita" 7W LEDs =>
Yita 2X White Angel Eyes Halo 7W LED Ring Marker Bulbs for x5 E39 E60 E63 E61 US | eBay
Strictly plug and play. No extra adapter or cable swap needed. Only had them on for a few days. This was an impulse buy because I couldn't resist the inexpensive $13 mods

Just turned off "cold monitor" as well, so we'll see how long these will last (oh...I also turned off the yellow side parking light a la E39 - they still function as turn signals, just not parking). My previous 5W LED ebay bulb only lasted about 6 months of very "light" duty with "cold monitor" still active, which is why I hadn't done anything LED to the Angel Eyes department for the past few years...until now

Figured that if it dies in 6 months, I just have to miss 1 meal to make up for it
The 20W version looked tempting, but I knew a looooooong time ago that the limiting factor was in the light tube design and the fact that I don't like a bunch of extra resistors/inverters hanging in the engine bay as some of those things are electrically very "noisy" - don't want any of that interfering with any of the engine management electronics.
As a comparison - driver side is the 7W LED bulb, passenger side is the OE 10W incandescent bulb. (I had to turn down the aperture setting to prevent over saturation so it's more of a real life representative of the actual light output). Real life impression is these LED bulbs do glow brighter than the OE bulbs. So I'm happy with the cheap mod so far