Completely agree about how horrible flicker is. There are occasional leds that don’t flicker. I believe (but I’m not sure) that they have to have am ac/dc converter. AC causes the flicker, but Direct Current delivers steady constant power. I have a random string light set that has (what i believe is) an ac/dc converter wall wart, and it doesn’t flicker at all. It’s just a random set I bought from a store.