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Duro-Test H33GL-400/DX 400w Mercury Vapor lamp with ancient looking arc tube Manufactured in '73, but it has a late 50s looking arc tube like in my old Westinghouse E-H1 mercury lamps. The electrodes are modern, tho. Keywords: Lamps

Duro-Test H33GL-400/DX 400w Mercury Vapor lamp with ancient looking arc tube

Manufactured in '73, but it has a late 50s looking arc tube like in my old Westinghouse E-H1 mercury lamps. The electrodes are modern, tho.

image~173.jpg image~125.jpg durotest400wmerc~0.jpg GEM400A3.jpg image~169.jpg
File information
Filename:durotest400wmerc~0.jpg
Album name:Silverliner14B / Mercury Vapor Lamps
Rating (3 votes):33333
Keywords:Lamps
Company and Date Manufactured:Duro-Test
Model Number:H33GL-400/DX
Wattage:400w
Lamp Type:Mercury Vapor
Filesize:99 KiB
Date added:Apr 01, 2010
Dimensions:1000 x 750 pixels
Displayed:417 times
URL:http://www.galleryoflights.org/mb/gallery/displayimage.php?pid=1612
Favorites:Add to Favorites

Comment 1 to 12 of 12
Page: 1

SeanB~1   [Apr 01, 2010 at 05:42 PM]
How do you get that clear shot of the interior constructin?
FGS   [Apr 01, 2010 at 06:51 PM]
Thin phosphor coating and a strong light source behind the lamp. You can still see it even on the main pic. (Barely)
Silverliner14B   [Apr 01, 2010 at 08:27 PM]
Yep the lamp has a thin phosphor coating. I held the lamp towards the window and took the pic of the inside.
streetlight98   [Dec 30, 2011 at 03:02 AM]
Do yuo know what month this was manufactured in?
Silverliner14B   [Dec 30, 2011 at 11:06 PM]
I think it was December 1973.
streetlight98   [Dec 31, 2011 at 01:07 AM]
Thanks. 9 month's difference. Cool
Silverliner14B   [Dec 31, 2011 at 01:35 AM]
From your GE M400 split door?
streetlight98   [Dec 31, 2011 at 02:26 AM]
Yep, 9 months between this and the M-400. Cool I've seen after looking under the Lamps album on GoL that there are quite a few lamps on here that were made in 1973 ^_^
GEsoftwhite100watts   [Sep 06, 2015 at 08:22 PM]
Neat lamp Dave! Have you lit it yet?
GEsoftwhite100watts   [Sep 06, 2015 at 08:22 PM]
Neat lamp Dave! Have you lit it yet?
Silverliner14B   [Sep 07, 2015 at 11:27 PM]
Yep I have, a while back. Works good.
merc   [Sep 08, 2015 at 05:34 AM]
1973 means early Yttrium Vanadate coating. IIRC it was introduced to MV lamps a few years before.
Is the light colour/quality (CRI) very different to modern DX coated lamps? Thanks.

Comment 1 to 12 of 12
Page: 1
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