Before putting in a color changing LED bulb (replacement bulb only into old light) I tried to use the covers but the Polaris 280 kept knocking them off and if I didn't rescue them in time the Polaris would drag them around the pool scratching them up and sometimes even chipping off the edges. That was the only pool cleaner I had, at the time, so I don't know if other types of cleaners will do that.
I have little covers for my free standing spa light and they fit on very tightly. If the pool light covers fit as tightly as the spa light covers I don't know if the Polaris would have knocked them off.
My pool light is an old Amerlite (possibly Pentair now), 8" lens, 120 volt; pretty standard in old pools. It uses a big incandescent bulb with standard Edison socket. The plastic covers fit over the glass lens between the inside edge of the metal outer ring and the lens.
gg=alice