I've done my own research on LED lights and really think they are worth the couple extra bucks you end up spending. I have found, both in experience and places like Consumer Reports, that the LEDs last twice (or more) as long as Traditional incandescent tree lights.
LEDs to me, appear brighter with a look that is more crisp.
A little paragraph I've found on on the power usage
"In December 2007, Consumer Report tests showed it cost $1.30 to operate conventional mini lights for 300 hours compared to 30 cents for LEDs. The cost for 50-foot strings of C7 incandescent lights was $8, while LEDs cost 14 cents. Regular C9 holiday lights cost $11 to operate; LEDs cost 14 cents."
"I have always thought of Christmas time, when it has come round, as a good time; a kind, forgiving, charitable time; the only time I know of, in the long calendar of the year, when men and women seem by one consent to open their shut-up hearts freely, and to think of people below them as if they really were fellow passengers to the grave, and not another race of creatures bound on other journeys." ~Charles Dickens