A glow cup remix of voorhees_matt's UV Glow Ring. https://www.thingiverse.com/thing:4131445
You will still need his switch base. Supports are needed, but put blockers on the small holes on the bottom. I used 1-½" 6-32 machine screws to assemble both pieces. Uses 1-¾" long ¼-20 bolt to mount.
The author hasn't provided the model origin yet.