Hi!
Want to share my experience.
Bought this one:
https://koka-shop.de/usb-led-gluehbirne.html
-cut the acrylglass to see whats inside.
-cut a ping-pong ball. I needed a round piece to change the color from white to magenta.
-I took 2 round pieces and put it one around the other. With one piece, the light was “too white”. 2 pieces made it darker, but more colorful.
-glued it all together.
-powered with a battery pack.
Works very good!