The urbis zx12 is a urbis zx2 with a zx1 optic system. My one is completely black and it runs on a 45w cosmopolis lamp. It has Philips electronic gear and a NEMA photocell socket with a zodion ss6 photocell in it.

Here is under the lantern 

Here is the canopy. You can see the 2 parts of the canopy.

Here is the optic system, zodion ss6 photocell and mounting spigot. Click on images to make them larger.

You can open the lantern by undoing 2 metal clips at the back of the lantern. 

Here are the 2 stickers inside the lantern.

Here is the choc-block connector and the Philips primavision electronic ballast.

Here is the 45w CPO-TW lamp in it’s removable lamp holder.