Hey mate,
I have 2 blue L.E.D neons under either side of my dash, They look really good, nice touch to the car,
What i did, is a run a power wire from the positive terminal of the batter, and install a switch in your car, and connect it all up,
My battery has never drained,
But last week i changed it to this:
i got the power wire and connected it to my Speedo lights dimmer, now it comes on with my lights, but its still connected to the switch, so i can still turn it off or on whenever i want too,
I have blue dash lights, Number plate lights, neons, so it all looks matched
heres a picture, not mine, but very similar, Looks nice. When you buy them, cut of the cigarette charger part
Good luck