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Merc Can Refit
Even though the 100w mercury recessed cans were disconnected in the mid 90s, many still remain installed. As you can see they're quite closely spaced so I can imagine this hallway would been bright with all the mercs going. They got replaced with the 2x32T8 wraparounds.  
Keywords: Indoor_Fixtures

Merc Can Refit

Even though the 100w mercury recessed cans were disconnected in the mid 90s, many still remain installed. As you can see they're quite closely spaced so I can imagine this hallway would been bright with all the mercs going. They got replaced with the 2x32T8 wraparounds.

IMG_20150214_183406.jpg TOR_IMG_20150121_172843.jpg IMG_20150107_201557.jpg IMG_20150107_193147.jpg TOR_IMG_20141204_203838.jpg
File information
Filename:IMG_20150107_201557.jpg
Album name:joe_347V / Commerical Lighting
Keywords:Indoor_Fixtures
Company and Date Manufactured:Prescolite, 1974
Wattage:100w
Lamp Type:Mercury vapour
Filesize:283 KiB
Date added:Jan 15, 2015
Dimensions:1600 x 1200 pixels
Displayed:364 times
Color Space:sRGB
DateTime Original:2015:01:07 20:15:57
Exposure Time:1/30 sec
FNumber:f/2.4
Flash:No Flash
Focal length:3.97 mm
ISO:903
Make:Lge
Model:Nexus 5
URL:http://www.galleryoflights.org/mb/gallery/displayimage.php?pid=18882
Favorites:Add to Favorites

Comment 1 to 9 of 9
Page: 1

GEsoftwhite100watts   [Jan 15, 2015 at 03:27 AM]
Not so bright now! Laughing
streetlight98   [Jan 16, 2015 at 07:36 PM]
Wow, I would have added more wraps, or better yet, just connected the recessed cans right to line voltage (assuming its 120V) and then used CFLs or LEDs, but back in the 90s those weren't really options (PL adapters are out but they're not exactly that effective).

A 100W MV, when new, gives about 4000 lumens, roughly equivalent to two F32T8s. I'm assuming with these they probably made the specifications with the dimming-out factor in mind.
vaporeyes   [Jan 19, 2015 at 05:18 PM]
I think that many 100w mercury cans were overkill....though if they didn't have the expensive & rare reflector lamps, a lot of the light was trapped in the fixtures. It looks quite dark now, though!
streetlight98   [Jan 19, 2015 at 08:09 PM]
The old lamps were overkill. The amount of light may actually be equivalent to the amount of light the mercs were giving off at the time they wre disconnected. Joe rescued one of the lamps and it's quite dim, possibly original to the fixture too! I think he said it was about as bright as a 40W incandescent at best.
joe_347V   [Jan 21, 2015 at 10:37 AM]
Yeah, they more of less all still have the original GE A23 /DX lamps from 1974. Some had newer lamps so I'm guessing they only spot relamped during the 20 years that they were used. Personally instead of installing the wraps, I would have retrofitted the fixtures to 50w CMH..maybe even every second fixture and just disconnect the others. LED or CFL would have been nice but the fixtures were wired for 347v so I guess they would have had to use either PLs with 347v ballasts or LED retrofit kits with a 347v driver.
streetlight98   [Jan 21, 2015 at 11:07 AM]
Ah I see. Here it seems all the lighting at my schools (besides gymnasium and maybe parking lot lights) is 120V. If these were 240 or 208V, you could run a neutral and convert them to 120V but with 277 and 347 (and probably 480V) you can't do that. I'm curcious what it would look like if the mercs were reconnected and just left as-is without the wrap lights. Must have been dim. And it would be cool to see them all relamped again. An idea came to me: perhaps the cans have a narrow lamp beam, which is why they're so close together?
GullWhiz   [Jan 21, 2015 at 07:01 PM]
do you have pictures of the lamps inside those fixtures or were the lamps removed?
joe_347V   [Feb 02, 2015 at 04:56 AM]
Ahh, I think the older buildings at my school have 120v lighting but for the most part, the lighting is 347v. Yeah even though so many fixture were used, the mercs at the time of retrofitting were as dim as a 40w incandescent. The bulbs were set pretty far back in the fixtures so I think they did have a pretty narrow beam. It would have been neat to go back to 1974 and see how this place looked with new lamps.

Most of the cans still had lamps inside but some floors had the lamps removed.
traffic light1   [Feb 02, 2015 at 12:09 PM]
T12HO Would look nice in a line right over the cans

Comment 1 to 9 of 9
Page: 1