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 t

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.