Bleg: A Reliable LED Christmas Light String for All-Year Outdoor Wrapping of a Tree

The subject says it all.  I have wrapped this damn ironwood tree twice and both times the lighting has not lasted.  Since a lot of lighting is designed for holiday use of 3 weeks a year, even something designed for 5 years of life dies in 4 months of continuous use.  For those who do not know, an Arizona native ironwood is gorgeous, one of the most sculptural trees I know of, but it is covered over every single surface with the sharpest thorns imaginable.  I lose a pint of blood every time I wrap this sucker so I want this to be the last time.