is that thing on top a cover for a photocell? or is it perma sealed? also is the ballast not there because someone took it out or is it meant to be remote ballasted? i've never seen one of these in real life as far as i can remember, very cool fixture.
It's all cast aluminum, there is no where to plug in a photocell, and they can be remote ballasted or burn incandescent, the mogul socket height is adjustable for different length bulbs so you maintain the correct optics, Thanks.