The design includes a groove in which LEDs can be inserted. I have this one:

https://www.amazon.de/Jsdoin-Lichterkette-Lichterketten-Kupferdraht-Batteriebetrieb/dp/B0BLYQGD2Z/ref=sr_1_5?crid=57K6C6OUQTXH&keywords=led+draht+lichterkette+mit+batterie&qid=1700146883&sprefix=led+draht+lichterkette%2Caps%2C100&sr=8-5

The star can simply be inserted into the stand. If desired, it can also be fixed in place with hot glue.

Material: Extrudr PETG transparent, 230°C, 85°bed