Thanks in advance as I am likely being overly careful or more likely just an idiot. I tried to google first but I could not seem to find any instructions and I did not find the original lamp housing. I am assuming that it is some home depot contractor special that’s no longer produced. Either way I am trying to change light bulbs and the only thing I can think of is to loosen the nub(?) on top of the casing (pic 3). This light is about 30 feet up above a skinny walkway that requires some creative not osha approved ladder stacking so I am trying to reduce air time to a minimum. I tried loosening the nub by hand but no dice so I was hoping someone here may have a similar lamp and can confirm that this is the correct approach. If so I was thinking maybe a vice grip or clamp to loosen the nut/nub? Any and all help is much appreciated.
TLDR: (Possibly) Rusted nut on top only way to access light interior for bulb change?