Return to the thumbnail page Display/hide file information See previous file See next file

MY FAVOURITE HID FIXTURE

MY FAVOURITE HID FIXTURE

Click to view full size image

These recessed fixtures are in my alma mater's chapel. There are 14 of three different sizes. They were installed around 1955-1956 during renovations. They were originally incandescent but converted to MH in 1998. I once talked about them with the maintenance head and he told me they were each 1000W incandescent. The building is made of wood, and after a while when they were all running, it started to smell like overheated wood in the attic. He told me they reduced the wattage with MH simply by adding ballasts in the attic (they are accessible from there). If I remember correctly, the largest are 400 watts and the two smaller sizes are 250W. I only have a key to the balcony so my photography of these lit up is limited.

The louvres appear to be painted light grey and there is a frost-patterned glass (not standard frosted glass) lens above the louvre. The MH does a much better job at lighting the chapel than the incandescent did.

glass.jpg inno2.jpg IMG_6078R_copy.jpg IMG_0412R.jpg

Light Information

Light Information

Manufacturer:Unknown
Lamp
Lamp Type:MH
Electrical
Wattage:250W and 400W
Physical/Production
Fabrication Date:1950's

File information

File information

Download: Download this File
Filename:IMG_6078R_copy.jpg
Album name:sol / Various
Rating (3 votes):
Keywords:Lanterns
File Size:314 KB
Date added:Sep 04, 2015
Dimensions:2465 x 1643 pixels
Displayed:335 times
URL:https://www.lighting-gallery.net/gallery/displayimage.php?pos=-111548
Favorites:Add to Favorites
Comments
Solanaceae
Hero Member
*****
Offline

Gender: Male
Posts: 1593
View Gallery

All photos are brought to you by Bubby industries.


GoL Solanaceae.Keif.Fitz Keif Fitz bubby_keif
View Profile Personal Message (Offline)
Sep 04, 2015 at 11:14 PM Author: Solanaceae
These look cool. Remind me of smaller glass lenses cans.
( ͡° ͜ʖ ͡°)

Me💡Irl
My LG Gallery
My GoL Gallery

Lumex120
Hero Member
*****
Offline

Gender: Male
Posts: 1386
View Gallery

105555521242365640724 UCM30tBQDUECOV6VeG5W87Vg zfarmadillo
View Profile Personal Message (Offline)
Sep 05, 2015 at 07:14 AM Author: Lumex120
I see you learned how to use Lenny face.
By the way, are the lamps enclosed in this fixture? I hope so...

Any machine is a smoke machine if you operate it wrong enough.

sol
Hero Member
*****
Offline

Posts: 992
View Gallery

View Profile Personal Message (Offline)
Sep 05, 2015 at 01:47 PM Author: sol
Yes, the lamps are enclosed. There is a flat glass that has a texture similar to the patterns frost makes on cold windows in winter. If you look closely at the full size picture you can see the texture between the rings. You cannot make out the shape of the lamps (BT or ED) through the glass, nor can you clearly see the arc tube. All lamps are clear, though. If I remember correctly, the glass was present with the incandescent lamps as well. I am not sure if the glass is original or not but I found a reference to textured glass above concentric ring louvres somewhere on the net (a scanned document from the 1940's or the 1950's).
themaritimegirl
Hero Member
*****
Offline

Gender: Female
Posts: 892
View Gallery

Florence


themaritimegirl themaritimegirl themaritimegirl
View Profile WWW Personal Message (Offline)
Sep 05, 2015 at 04:30 PM Author: themaritimegirl
Wow, 14000 watts of incandescent light is pretty impressive.

Electrical Engineering Graduate
YouTube | Twitter | Instagram

sol
Hero Member
*****
Offline

Posts: 992
View Gallery

View Profile Personal Message (Offline)
Sep 05, 2015 at 06:17 PM Author: sol
Hence the overheated wood smell. I imagine it made a small différence in the power bill but not much as these weren't used that much. If the room was used in the daytime the lights were mostly kept off. The stained glass windows aren't that dark so there is a lot of daylight. Now with the MH they are used a bit more in the daytime. Of course they are used at night when the room is in use. Unfortunately, there aren't any provisions for standby lights during a hot restrike.
sol
Hero Member
*****
Offline

Posts: 992
View Gallery

View Profile Personal Message (Offline)
Sep 05, 2015 at 06:33 PM Author: sol
Oh, and the 14 000 watts of incandescent, how impressive it was, was not quite enough for the size of the room. According to the Lumen to Watt calculator the equivalent to 1000 watts incandescent would be about 175 watts MH. The combination of 250 and 400 watt MH lights it up quite nicely.
themaritimegirl
Hero Member
*****
Offline

Gender: Female
Posts: 892
View Gallery

Florence


themaritimegirl themaritimegirl themaritimegirl
View Profile WWW Personal Message (Offline)
Sep 05, 2015 at 07:33 PM Author: themaritimegirl
Really? When I got my 175W MH lamp, I compared its light output to that of various A and PS-shaped incandescents, and I found that around 500W was equivalent.

Electrical Engineering Graduate
YouTube | Twitter | Instagram

Lumex120
Hero Member
*****
Offline

Gender: Male
Posts: 1386
View Gallery

105555521242365640724 UCM30tBQDUECOV6VeG5W87Vg zfarmadillo
View Profile Personal Message (Offline)
Sep 05, 2015 at 07:56 PM Author: Lumex120
Could you try to get a pic of the whole building with the lights? I really want to see what they all look like.

Any machine is a smoke machine if you operate it wrong enough.

sol
Hero Member
*****
Offline

Posts: 992
View Gallery

View Profile Personal Message (Offline)
Sep 06, 2015 at 07:08 PM Author: sol
@TheMaritimeMan : I haven't made any real life tests, I just went by what I was told and what the lumen calculator gives. You might be correct, and other factors would change some parameters like the reflector, the position of the filament or arc tube in the reflector, etc. Nevertheless, the MH lamps in this room give more light than the incandescent did. At least some of the incandescents were on dimmers, but at full brightness it was still quite dim in there.

@Zarlog : I can't promise as I am not there often (in that part of the building). If ever I get the chance to do so, I'll post here.
streetlight98
Sr. Member
****
Offline

Gender: Male
Posts: 323
View Gallery

Mike McCann


GoL 88219189@N04/albums
View Profile WWW Personal Message (Offline)
Mar 05, 2017 at 09:22 PM Author: streetlight98
Actually, 1000W incandescent lamps are equivalent to a 250W MH lamp (~23000L; the same as a 400W MV lamp) so the 250W MH lamps are a lumen-match. The 400W MHs are 36000L but they'll dim down to about 32000L by EOL. Remember that as lamp wattage increases, LPW increases. Roughly speaking, MV is 2X as efficient as incandescent.

To resist is to piss in the wind, anyone who does will end up smelling.

© 2005-2019 Lighting-Gallery.net | Powered by: Coppermine Photo Gallery