Please review attached Installation Instruction Sheet. I would recommend to get someone qualified to come and install the light. https://img.acuitybrands.com/public-assets/catalog/347674/ut459805_lbl-installation-instructions.pdf?abl_version=11%2f11%2f2020+07:51:03&DOC_Type=Installation_Instruction_Sheets
I have used LED bulbs in my fixtures. I think the yes and no answers (which I have not read) may come from some confusion over the type of bulb. These fixtures have ballasts in them, so you have to use bulbs compatible for use with ballasts (or the type that operate with or without, which is what I buy).
Please review attached spec sheet https://www.homedepot.com/p/Lithonia-Lighting-Wrap-Multi-Volt-2-Light-White-Ballast-Ceiling-Flushmount-LB-2-32-MVOLT-MVIS/202591813
6 fixtures. I run the simulation for 12 ft ceiling.
Batman, The connection can be made from inside the fixture to the next lamp fixture.
Push the cover up, slide it to the side, then let it down on the free side. There is just barely enough room to accomplish this. I think this video will help:
It is 48" long. The width vaires. The part that attaches to the ceiling is narrow, perhaps 6". Like all fluorescent fixtures, it flares away from the ceiling. The lenses are ~ 10" wide.
No, must wire into an existing system or install a switch if you want direct control at the light.
1/4 turn is all you need, don't over turn them