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GE 2xF40T12 Ballast - 8G1120

GE 2xF40T12 Ballast - 8G1120


A GE 2-lamp F40 LPF rapid-start Ballast

This is an unusual one in that its the same size as a HPF 2x F40T12 ballast. Like many LPF ballasts it will not run 34w lamps. As you can see it's leaked some 'tar' (says "no PCB's so should be ok)

Note: image was edited to make the darkened portion of the label readable.

277U2X40.jpg A_RQM2S4.jpg GE2X40LP.jpg GE40BAL1.jpg

Light Information

Light Information

Manufacturer:GE
Model Reference:8G1120
Lamp
Lamp Type:Linear Fluorescent
Base:Medium Bi-Pin
Shape/Finish:T12
Fixture
Fixture Type:2-Lamp
Ballast Type:Rapid Start Magnetic
Socket Type:Medium Bi-Pin
Electrical
Wattage:2x40
Voltage:120
Current:.67a
Optical
Lumen Output:(dim)
Lumen Efficacy:Low Power Factor
Physical/Production
Dimensions:8.5x1.75x1.25 inches
Factory Location:Mexico
Fabrication Date:-unknown-
Application/Use:General Lighting

File information

File information

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Filename:GE2X40LP.jpg
Album name:xmaslightguy / Fluorescent Ballasts - Electromagnetic Rapid Start
Keywords:Gear
File Size:39 KB
Date added:Nov 17, 2010
Dimensions:600 x 221 pixels
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Comments
Kev
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Nov 18, 2010 at 12:56 AM Author: Kev
Looks reliable though. Why will these not run the 34W then?

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xmaslightguy
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Nov 18, 2010 at 07:12 PM Author: xmaslightguy
@kevxsi16v
In general Rapid Start ballasts (weather HPF or LPF) are reliable, some seem to last forever! (but they are magnetic afterall LOL)

Something about the 34w lamps causes these (and LPF RS ballasts in general) to over-heat. Thermal protection will shut down the ballast til it cools off at which point it'll turn back on (but its ofcourse not good for it to be getting that hot...and if the protection fails/gets stuck 'on'...um...well...burnt ballast smells really bad )

I don't know _why_ those lamps cause over-heating, maybe someone else can explain it?

Colored Fluorescent's such as F40T12 Red or  Green or Blue are awesome...

suzukir122
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Jun 22, 2011 at 05:03 PM Author: suzukir122
So with Bonus Line ballasts, when it's low power factor,
you can tell by the missing "PF above 90%?"

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xmaslightguy
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Jun 22, 2011 at 06:11 PM Author: xmaslightguy
The HPF ones will also have a input current rating of around .75 to .8 amps where LPF will generally be .6x amps

Full-sized LPF ballasts like this are rare, most are smaller than a standard HPF ballast...

Colored Fluorescent's such as F40T12 Red or  Green or Blue are awesome...

don93s
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Jun 22, 2011 at 08:39 PM Author: don93s
I've checked out some of these ballasts before. I have the Advance, Valmont, and Robertson version. The line current ranges from .60 to .67a and were commonly sold in residential fixtures, especially during the 90's. Far as I know, these are still HPF because they use a capacitor...that's why the full size. They do have a reduced output of only 300 ma lamp current. Does this ballast rectify EOL lamps? If so, sometimes the cap shorts and ballast converts to LPF.
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Jun 22, 2011 at 08:59 PM Author: xmaslightguy
This one does rectify EOL lamps (in the exact way one of the 'smaller' LPF ballasts does) .. it always has LOL
34w lamps will cause it to overheat just like a normal LPF ballast (I actually had 2 of these at one time, but the 2nd one quit...i think because the fixture ended up with a 34w lamp)

Colored Fluorescent's such as F40T12 Red or  Green or Blue are awesome...

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Jun 22, 2011 at 09:20 PM Author: don93s
Interesting for sure. I do know GE had some strange ballasts over the years. The weirdest was one I removed from a troffer fixture. It looked just like yours but had a line current rating of 1.0 amp on the label and it would rectify lamps as well. I don't remember if it said HPF, but it was full size and had same style label from same era. I had suspected a shorted cap as I had seen happen on other types, including the full power ones.
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Jun 22, 2011 at 10:36 PM Author: xmaslightguy
That one of yours does sound interesting... _if_ it made proper use of of that 1-amp you'd have a nice bright light! I guess a small overdrive there LOL

Colored Fluorescent's such as F40T12 Red or  Green or Blue are awesome...

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