OK, I've had it with old Christmas tree lights.
I spent way too many hours putting in a bulb, taking out a bulb, searching for that blown one that keeps all the others from lighting.
Even the strands of lights I bought last year are defective.
I finally got so fed up, I threw them all away. Which I plan to do every year from now on except for the $75 of purple lights I ordered online that are hard to find in department stores.
Now that I think about it, we have it pretty easy compared to the big-bulb stands that were popular for Christmas trees in the '50s and '60s. My mother burned many a fingertip changing out one color so it wouldn't be next to the same color.
By the way, purple lights are very dark, and white lights had to be added to lightened up the tree just to see the ornaments.
It took me five hours to put those babies on. Oh well, the tree looks beautiful during the day!