20pcs x 8V-12V Pre Wired Bright SMD LED,0603 uv SMD Led Lamp,8V-12V 0603 Light,2mm Square 0603 Purple Led (20cm)

https://a.co/d/0ffzO3YcPinch the wires to either side of a watch battery. Or get fancy and solder a 9v battery connector on, so you can let it cure the inside of hollow prints really thoroughly.