I bought LED lights at Sam's Club, 50 lights on a string.
The pros: reduces your energy bill and can connect up to 46 strands on one single outlet, where as my old Christmas lights I could connect only 3 to an outlet (any more would cause a blowout); plastic bulbs in comparison to glass bulbs.
The Cons: Not as bright or as decedent regular Christmas lights.
"Never doubt that a small group of thoughtful, committed citizens can change the world; indeed, it's the only thing that ever has." -Margaret Mead