I purchased a 6cm x 1.8cm LED light base from Temu a while back, and had trouble using it for everything I wanted to sit on it because the insert where the LED board was just a hole with no cover.  I have a glass jellyfish I have always wanted to place on it, but just didn't have confidence it wouldn't fall over.  So, I finally got around to making a cover for it.  Best if used with a transparent filament.  I printed mine in clear transparent PLA from Elegoo, but I figure any transparent PLA would work fine for this use case, I plan on getting a few more lights now that I have this model and will likely expand my use of them with more transparent colored filaments.

I recommend printing with the top surface against the build plate.  No supports needed.

Link to LED light on Temu: LINK

V1 is a simple insert to close the hole.

V2 adds a 60cm base on the top side to make the platform itself seamless.