Here's a Form 400 PowerPack that lights an old driveway next to a rail spur. I believe there's around three or four of them left. Click here for the streetview.
Could an all-cast clamshell pass as the first cobrahead? I mean this has a one piece upper housing (well, minus the electrical cover on top), and an internal reflector.
Yeah I thought so too but the Form 400 and I think the OV20 used internal reflectors. My OV-10 uses one reflector. The inner reflector is also the outer one. The inside is mirrored (well it doesn't reflect an image but you get when i mean lol) and the outside is anodized.
And yeah I wonder if these were ever consider cobraheads at one point...they seem to have all the features of them except for the cobra like shape.