This is a replacement mounting clip for some 8' T8 LED shop lights (https://www.amazon.com/gp/product/B07MJJB5JR/ref=as_li_ss_tl?ie=UTF8&psc=1&linkCode=sl1&tag=groundzeromar-20&linkId=f3ea17a2ff19862b18ba4da74b3e37cf&language=en_US). The metal clips that come with them are a joke and come off very easily (many reviews talk about people having their shop lights fall down randomly).

These print quickly and hold really well. They flex a little to make them easy to snap onto the light, but once the two screws are put in are very rigid and secure. I'm using 2 - 3 per 8' light, depending on where the studs are (the lights are very light; ie not heavy, no pun intended).

The OpenSCAD file is included if you need to tweak it to fit your lights or situation. I printed them on their side so that the part of the clip that interfaces with the light was nice and square rather than stringy and messy from the overhang.

I've also included a version with an end cap (untested), and an STL with 6 copies close together to be printed all at once.

I printed them in PLA at 0.25 layer height and 40% infill.