You gotta realize it only takes 20mA to power them at full power...
I have 12 LEDs in place of my dome light and the front 4 have a very slight glow to them when its on "door". Its just the residual power held in the wire... if the grounding on our cars was perfect, this wouldn't be a problem. Also, your never gonna notice that w/ the halogen that was in there from the factory... not enough power to make that thing glow at all.
I HAVE the grounding upgrade, just haven't had the weather or the time to install it yet. I'll let ya know if it makes a difference. I don't think it will... so just stop whinning and deal with it.