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Anatomy of a Ryerson Can
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.
Keywords: Indoor_Fixtures

Anatomy of a Ryerson Can

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.

20171113_210632.jpg 20171013_195331_M.jpg 20171020_211440.jpg IMG_20160312_143117.jpg IMG_20160312_142129.jpg
File information
Filename:20171013_195331_M.jpg
Album name:joe_347V / Commerical Lighting
Keywords:Indoor_Fixtures
Company and Date Manufactured:Prescolite, October 1970
Model Number:1054H5-100MV-720
Wattage:100w
Lamp Type:Mercury vapour
Filesize:341 KiB
Date added:Oct 31, 2017
Dimensions:2528 x 1080 pixels
Displayed:403 times
URL:http://www.galleryoflights.org/mb/gallery/displayimage.php?pid=22275
Favorites:Add to Favorites

Comment 1 to 11 of 11
Page: 1

LilCinnamon   [Nov 01, 2017 at 05:52 PM]
Is this fixture in use still or did they leave it there and cover it up with ceiling tiles in favor of like florescent lighting?
joe_347V   [Nov 02, 2017 at 04:07 AM]
They disconnected it in the mid 90s in favour of a 2x F17T8 fluorescent wraparound but left the fixtures and lamps in the ceiling. Only a select few were removed or covered up.

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.
streetlight98   [Nov 03, 2017 at 11:52 PM]
Huge fixture considering the 'tiny' 6-inch opening on the bottom! Shocked Looks brand new after all these years though. I wonder if these are 120V or 347V?
joe_347V   [Jan 26, 2018 at 06:58 AM]
Yeah the back of reflector seems to be in great shape for a 40+ year old light. I believe they were 347v since most of the fluorescents were also 347v.
joe_347V   [Oct 05, 2018 at 02:14 AM]
I managed to score one of these, perhaps the same exact one in the pic as it came with the exit sign next to it. Anyway it's a older Prescolite 100w mercury can and is 347v. It had the original CGE ballast inside but the ballast was single tap.
streetlight98   [Oct 05, 2018 at 02:36 AM]
aye too bad the ballast is single tap but awesome you got a complete can! Any plans to try and hunt down an elusive 120V f can H38 ballast and an NOS A shape lamp for it? Smile
joe_347V   [Oct 05, 2018 at 02:43 AM]
Suprisingly I actually have the 120v version of that 100w CGE ballast from around the same vintage from a 100w Holophane wallpack that I'm restoring.

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.
streetlight98   [Oct 06, 2018 at 04:41 PM]
Hmm yeah I wouldn't rip it apart either. If my future house has an overhang over the front door I'd like to install one or two recessed cans that are either low watt PSMH or low watt MV (like 75 or 100). The reflectors on these are way bigger than I imagined. I figured they's be the size of the trim piece in diameter.
joe_347V   [Oct 06, 2018 at 07:36 PM]
Ahh, I guess I'll set it aside in case I get the chance to install it in the future. I think the only place I could install this is over the front door since it's deeper than your typical house joist depth so it won't really fit in the ceiling anywhere else.

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.
xmaslightguy   [Oct 15, 2018 at 12:41 AM]
looks/sounds like its kind of a beast Laughing
Nice save though!
joe_347V   [Oct 17, 2018 at 01:58 AM]
Thanks! It's a beast compared to your modern HID can.

Comment 1 to 11 of 11
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