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MH400 BT28 U Cracked arc tube in this bulb. BT-28 outer to fit smaller fixtures. Date code "b028" Keywords: Lamps

MH400 BT28 U

Cracked arc tube in this bulb. BT-28 outer to fit smaller fixtures. Date code "b028"

CIMG2975.JPG CIMG2942.JPG CIMG2809.JPG CIMG2691.JPG CIMG2668.JPG
File information
Filename:CIMG2809.JPG
Album name:rlshieldjr / Misc Lighting and Non-lighting
Keywords:Lamps
Company and Date Manufactured:Sylvania
Wattage:400
Filesize:26 KiB
Date added:Aug 23, 2010
Dimensions:480 x 337 pixels
Displayed:1519 times
Color Space:Uncalibrated
Contrast:0
DateTime Original:2010:08:21 17:27:32
Exposure Bias:0 EV
Exposure Mode:0
Exposure Program:Program
Exposure Time:1/320 sec
FNumber:f/2.8
Flash:No Flash
Focal length:6.2 mm
ISO:100
Light Source:Unknown: 0
Make:Casio Computer Co.,ltd.
Max Aperture:f/2.8
Model:EX-Z9
URL:http://www.galleryoflights.org/mb/gallery/displayimage.php?pid=3137
Favorites:Add to Favorites

Comment 1 to 10 of 10
Page: 1

Form109   [Aug 23, 2010 at 05:11 AM]
personally i don't care much for *Cram Lamps* i would think that there's more thermal stress on the arctube.

This must be a Position restricted lamp with those Indentions in the screw base?
rlshieldjr   [Aug 23, 2010 at 05:19 AM]
Those indentations are to hold the base and bulb together.
Tmcdllr   [Aug 23, 2010 at 05:38 AM]
Wow, now that's a blackened arc tube!
GullWhiz   [Aug 23, 2010 at 10:09 AM]
February 2000 or Feb 2010 not sure which one
gailgrove   [Aug 23, 2010 at 02:01 PM]
Jace I would assume February 2000 since Sylvania's are good ones Wink
GullWhiz   [Aug 23, 2010 at 02:30 PM]
easy way to tell...if it has a circle "Hg" on it then 2010 but if no Hg on it then 2000
rlshieldjr   [Aug 26, 2010 at 07:10 PM]
Must be 2000 as it has been in use for many years and we got a box of 6 to replace one at ahother location about 8 years ago. Doesnt have Hg symbol on bulb.
streetlight98   [Jan 29, 2011 at 11:52 PM]
I have a 250w metalarc that hasthat white stuff chipping too. Is that a bad sign?
gailgrove   [Jan 30, 2011 at 12:02 AM]
My 1KW Sylvania also has it, I don't think there is anything wrong with it being like that.
rlshieldjr   [Sep 27, 2018 at 06:58 PM]
I replaced another 400w cram Sylvania, seemed to last quite a while, even at horizontal burn.

Comment 1 to 10 of 10
Page: 1
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