you can use plenty of different LED strips. here are two that I've liked. the first is used in these pictures. one is a COB LED set with a wall plug that's a bit nicer and more expensive and the other is a 2 pack (USB) that's a better value but not quite as bright. these are affiliate links for reference
Lam(MS)pen COB - https://amzn.to/3MJfSVU
Enqiqi - https://amzn.to/40GpLJB
if you need a USB wall adapter I use this pack - https://amzn.to/3ufIyzv
two different tops. one with less small bits and is easier to print and a bit cleaner, one that's more true to form
another decent option if you're going to keep the lightbox near, but not mounted against the wall is to punch some negatives/edit the file and cutout rings in the back for a nice backglow.
sometimes you get wisps of filament depositing places they shouldn't (ie. black strands showing up in white space). fixing those will be some trial and error but here are some tips: