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General electric M400A1 Full Cutoff
250 watt HPS
Keywords: American_Streetlights

General electric M400A1 Full Cutoff

250 watt HPS

My_Stuff_052.jpg My_Stuff_051.jpg 000_0016.jpg 000_0034.jpg My_Stuff_009.jpg
File information
Filename:000_0016.jpg
Album name:NiMo / Bassman
Keywords:American_Streetlights
Filesize:187 KiB
Date added:Feb 10, 2012
Dimensions:1280 x 960 pixels
Displayed:132 times
Color Space:sRGB
Contrast:0
DateTime Original:2011:09:04 01:23:30
Exposure Bias:0 EV
Exposure Mode:0
Exposure Program:Program
Exposure Time:1/15 sec
FNumber:f/3.1
Flash:No Flash
Focal length:6.5 mm
ISO:160
Light Source:Unknown: 0
Make:Eastman Kodak Company
Max Aperture:f/3.1
Model:KODAK EASYSHARE M530 Digital Camera
URL:http://www.galleryoflights.org/mb/gallery/displayimage.php?pid=10693
Favorites:Add to Favorites

Comment 1 to 8 of 8
Page: 1

GEsoftwhite100watts   [Jun 22, 2013 at 08:16 PM]
I might be getting a 250w HPS M-400A soon...
streetlight98   [Jun 22, 2013 at 09:04 PM]
Your M-400A is drop lens though isn't it?

Is this glass frosted/fogged or is it just dirty?
GEsoftwhite100watts   [Jun 22, 2013 at 10:10 PM]
Indeed it is drop lens...and the refractor alone is at lease 10 pounds I'd say...
streetlight98   [Jun 22, 2013 at 11:37 PM]
yeah there's nothing lightweight about glass refractors that's for sure! They'll certainly outlast plastic though as long as they're not subject to abuse.
GEsoftwhite100watts   [Jun 22, 2013 at 11:42 PM]
Like vandals, etc...yeah those plastic lenses will yellow badly, I see it all the time!
streetlight98   [Jun 23, 2013 at 12:57 AM]
Only polycarbonate lenses yellow. Acrylic ones don't yellow. Polycarbonate is more vandal resistant than acrylic but it's more expensive and yellows over time. Acrylic is less vandal resistant but it's cheaper and doesn't yellow which is why acrylic is the most commonly used lens when using plastic. I think acrylic is a little newer than polycarbonate which is why when older fixtures have plastic lenses, they're typically polycarbonate and that's why they yellow. Glass is the most expensive but it's the only one that can resist high heat without damage so that's the only reason it's used nowadays. Of course glass is offered for all wattage cobraheads but plastic is usually only offered up to 150 or 175W lamps in small fixtures and 250W (HPS only) for medium. I personally prefer glass lenses but i like plastic lenses too, mostly becuase there's more of a variety of plastic lenses than there is glass. for lower wattage lights acrylic is the most economical in most situations.
NiMo   [Nov 09, 2013 at 07:40 PM]
@streetlight98, the glass is "stippled" which was standard for the earlier M400A1 cutoffs. I think this was a way GE used to diffuse the harsh HPS light.
streetlight98   [Nov 09, 2013 at 08:27 PM]
Ahh interesting. Joe Maurath has a 1980 50W HPS OV-15 TuDor cutoff light that has a stippled glass too. I wonder why they stopped using the diffused FCO glasses. It really does cut back on the glare from the bare lamp. Even a 50W HPS is harsh to look at without some form of a diffuser.

Comment 1 to 8 of 8
Page: 1