The History of Christmas Lights

You're buying bargain bin lights that have an insufficient/nonexistent decoupling capacitor. I really can't tell you which brands to look out for since 90% of them are the same Chinese garbage. You'd have to look at display models in the store to find good ones. Either shake your head from side to side or wave your open hand in front of the lights to test if there's a strobe effect. Expensive LEDs like those sold for smarthomes generally have better circuitry. If you're feeling adventurous, you could solder a capacitor in series yourself. RGB lights will look bad when producing white light, but they also sell strips that come with RGB as well as a warm white diode.

This is what the pros use-

https://www.christmasdesigners.com/100-light-2800k-warm-whit...

They are full-wave rectified so they don't flicker, and have an interesting semi-directional output them gives them visual interest when draped on the strand that brings to mind old-style incandescent bulbs.

A warning, though--these are way too bright to use indoors.

I still have bubble lights on my tree. My girls love them.

"Access Denied - Sucuri Website Firewall If you are the site owner (or you manage this site), please whitelist your IP or if you think this block is an error please open a support ticket and make sure to include the block details (displayed in the box below), so we can assist you in troubleshooting the issue."

Ominously: "Block reason: Access from your Country was disabled by the administrator."

I know the UK isn't everyone's cup of tea but this is a bit over the top 8)

Where are you from (P)?

They're an American only retailer. If you go through their order process for some random lights you find the country selector only has the US in it

They have been programmed for years already. Have you seen any Christmas light displays set to music?

Like this?

https://www.adafruit.com/product/1461

Same from Portugal