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Anatomy of a Ryerson Can
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Not exactly sure why they opened the ceiling up but at least it gives a view of the innards of a typical Ryerson 100w mercury recessed can. They seem to be pretty substantially built fixtures, it even has a heatsink around the socket to dissipate the heat from a high wattage lamp. Interestingly these don't use a f-can ballast and instead have the ballast inside the box on the right. These might use a potted core and coil. EDIT I've since gotten one, they use a regular un potted core and coil.
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I scored a lamp from one and it still works but very dim. I think they only spot relamped these since the lamp I got was from the 70s.
Since this fixture has a un potted ballast case, I can install pretty much any core and coil ballast in it. I may convert it to 70w PSMH so I can run 100w MV on the same ballast and to see how a PSMH retrofit would have looked lol. I have some NOS Philips A shaped 100w mercs that I might use. I have the original lamp too, it's a GE A23 from 1990 that's dimmed out.
The reflector is a good candidate for a high high bay conversion too but I kinda don't want to tear this light part. I have been eying them for a while lol.
Yeah the reflector is around 10" in diameter, the opening for the trim is around 6". My other HID cans, the Lightoliers have the reflector the same diameter as the trim.
It seems like with a socket changeout I can run 175w mogul lamps in it. The reflector is big enough for sure. I found an old catalogue of them and they made these in a fair number of models.
I wanted to see how it looked with a new MV lamp so I replaced the original ballast (which was quite toasty) with a 70w PSMH ballast. I also installed a new Sylvania ED17 100w /DX lamp to see how it looked. A new lamp is a lot brighter. I also tested it with a 70w CMH and that was bright as heck lol. I have 3 NOS A23 lamps but I need to track them down. After my testing I'll probably remove the ballast and disassemble the light for storage.
Nice save though!