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US Fluorescent NPF ballast
A replacement ballast in one of my 1970s Sears shoplights.  This one never did mercury migrate, even after being on almost 72 hours straight.  
Keywords: Gear

US Fluorescent NPF ballast

A replacement ballast in one of my 1970s Sears shoplights. This one never did mercury migrate, even after being on almost 72 hours straight.

collection_photo_share_email_thumb.jpeg PICT0011~1.JPG PICT0001~4.JPG PICT0005~5.JPG PICT0017~1.JPG
File information
Filename:PICT0001~4.JPG
Album name:GEsoftwhite100watts / florescent bulbs
Keywords:Gear
Company and Date Manufactured:US Fluorescent
Wattage:2X40/34/25w
Lamp Type:Fluorescent
Filesize:333 KiB
Date added:Jul 27, 2014
Dimensions:2000 x 1500 pixels
Displayed:122 times
Color Space:sRGB
Contrast:0
DateTime Original:2003:01:01 00:00:00
Exposure Bias:0 EV
Exposure Mode:0
Exposure Program:Program
Exposure Time:1/30 sec
FNumber:f/3.2
Flash:No Flash
Focal length:9.7 mm
ISO:200
Light Source:Unknown: 0
Make:Minolta Co., Ltd.
Max Aperture:f/3.2
Model:DiMAGE Z1
URL:http://www.galleryoflights.org/mb/gallery/displayimage.php?pid=17915
Favorites:Add to Favorites

Comment 1 to 7 of 7
Page: 1

streetlight98   [Jul 28, 2014 at 12:28 AM]
Don't the lamps have to be bad for that happen though? I dont think it would do it to good lamps. Neutral

I never have gotten why they made residential only ballasts. They're just crappy cheaper ballasts, but how much more money can a "real" HPF ballast cost to make? Confused These things ruin the reputation of fluorescent lighting and are just poor excuses for ballasts as it is. If people don't need 80 watts of light they can either use one F40T12, or an F20T12 or something. No need for these junky things. Mad Rolling Eyes Laughing
GEsoftwhite100watts   [Jul 28, 2014 at 04:53 AM]
One of the lamps I used was a spent Norelco F40CW; ironically the first lamp I ever saw the Norelco name on as a child!
Me either...I like full power HPF rapid start better any day! If this ballast dies it will be replaced by a NOS HPF rapid start or an electronic RS T12 ballast or IS T8 ballast.
A_lights   [Jul 28, 2014 at 05:41 AM]
Try putting the EOL side on the yellow wires?
GEsoftwhite100watts   [Jul 31, 2014 at 02:29 AM]
I did IIRC...it kinda flickered dimly like it was on a HPF ballast though. The MagneTek rectifies for sure but I need to test it for the same 72 hours...it only got about 18 before I left out of town again...
streetlight98   [Jul 31, 2014 at 02:59 AM]
LOl my parent's get mad when I have lights on during the day so the most my lights are used a day would be a couple hours. (except of course for when the garage lights were accidentally left on over night and the '50s preheater died.)
GEsoftwhite100watts   [Jul 31, 2014 at 03:31 AM]
Same here except for the mercury migration thing which I admittedly did when I was home alone... Laughing
GEsoftwhite100watts   [Sep 07, 2014 at 12:14 AM]
I'm now using this ballast as an improvised preheat one, with lamps between the red/blue wires. Problem is, it only lights one at a time though.

Comment 1 to 7 of 7
Page: 1