How do you choose a power source for LED lights? Of course there’s no correct answer to this question, but there some definite things to consider. Most of our LED light fixtures are 12V or 24V DC. These low-voltage LEDs can be powered by either a plug-in adapter or a hard-wired power driver. (If you need to know how much power you need for a given number of feet of strip light or of fixtures, see our page How Much Power Do I Need.) To choose whether to use an adapter or driver for your LED light installation, here are some basic questions you should answer first.