Edit: So I added a fixed version of the light bar arm, on my slicer software, it had gaps. This version should not have gaps now. Cura seemed to be ok I think though. Also, added a "screw" that you push into the top so hopefully the little clips wont break as easy. Please try it out!
This is the new version of my light bar from here https://www.thingiverse.com/thing:2962745
The light bar itself is here to buy:
https://www.amazon.com/gp/product/B06Y3Y16R6/
This version is longer and bends so the angle of the light is improved. Much better lighting imo.
Example video of new lighting (change to highest quality to enjoy)
https://www.youtube.com/watch?v=aYsOingA2To&feature=youtu.be
Technical
I printed with PETG at 50% infill with supports. Originally I did PLA but the little arms broke when putting it in the printer. So PETG seemed to be stronger, did not break.
I ordered the LED strip and printed the bars from Thingiverse: That's a very nice solution.
As the LED strip can not be controlled by switching on and off power remotely, I think about switching to another led strip. Do have the bar for available in any CAD format? STL isn't a good choice if you try to make any changes in a 3D program.