Hubby and I bought a few strings of white ones for over the garage 3 Christmas' ago and also a neat string of 'colour changers' which start off red, but then change to green!
They aren't the big one's you are talking about, but we've had all 3 strings plugged in together then the last one running to an extension cord to the outlet. They've been on every night from mid-November to January for 3 years and they're still doing great.
We have 'soft' whites for the white ones and they aren't as hard on the eyes and have sort of that old 'incandecent' glow...LOL.
Thinking about buying a string of LEDs for the tree this year and seeing how they compare to the regular ones