2x2 U-Bend Fluorescent Troffers

Here are four 2x2 prismatic fluorescent troffer light fixtures in the underwater manatee observatory at the Homosassa Springs Wildlife State Park in Homosassa, Florida. These pictures were taken on 6/10/2024 during my mom's and my annual trip to the park. These fixtures seem like they have F40T12/U6 lamps in them. Since that is the case, they probably have magnetic rapid-start ballasts. These fixtures are probably only used when the maintenance crew cleans the observatory. They are never on when we are there.