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GE F20T12 Kitchen and Bath, Possibly EOL

GE F20T12 Kitchen and Bath, Possibly EOL

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Here’s a GE F20T12 warm white lamp that has possibly gone EOL. When I flip the switch on, it just glows dim orange at the ends, as if the cathodes cannot excite the mercury gas. This is a preheat setup.

Any ideas on why this one isn’t working? Could it be a ballast and/or starter problem? Thank you!

D6A112A6-6862-4CF2-AE94-876CA9398A6A.jpeg C7AB15F0-3397-4E61-8880-06EB6ECEAA04.jpeg D7F24D2E-A81E-4C90-907C-B3D9B53389AE.jpeg IMG_3946.jpg

Light Information

Light Information

Manufacturer:General Electric
Lamp
Lamp Type:F20T12
Base:T12
Fixture
Location:South Carolina
Electrical
Wattage:20 Watts
Voltage:120 Volts
Optical
Color Temperature:3000K
Color Rendering Index:About 80
Physical/Production
Factory Location:Bucyrus, Ohio USA
Fabrication Date:2000’s
Application/Use:Kitchen and bathroom lighting

File information

File information

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Filename:D7F24D2E-A81E-4C90-907C-B3D9B53389AE.jpeg
Album name:CEB1993 / Fluorescent Lights
Keywords:Lamps
File Size:541 KB
Date added:Sep 09, 2019
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Date Time:2019:09:07 15:15:34
DateTime Original:2019:09:07 15:15:34
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Beta 5
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Sep 09, 2019 at 08:46 AM Author: Beta 5
Sounds like a stuck starter. If you replace the starter it will probably work again, as it doesn't really look blackened at the ends.

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nicksfans
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Down with lamp bans!


GoL the.baus.of.all.bauses UCDl2EWWZc9h1IZXcfGU9OZA nicksfans
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Sep 09, 2019 at 11:13 AM Author: nicksfans
I agree; if the ends just sit there glowing steadily, it's a stuck starter. You might be able to unstick it by flicking it a few times.

I like my lamps thick, my ballasts heavy, and my fixtures tough.

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Beta 5
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Sep 09, 2019 at 11:24 AM Author: Beta 5
It could be the capacitor in the starter that's shorted instead of the contacts, if so you can open up the starter remove this and it should work. You can also get the tube lit by switching it on with the starter in, and then twisting the starter out after a couple of seconds, the tube should then light when you remove the starter.

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CEB1993
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Sep 09, 2019 at 12:22 PM Author: CEB1993

I agree; if the ends just sit there glowing steadily, it's a stuck starter. You might be able to unstick it by flicking it a few times.


Hey thanks Nick! Do you know what kind of starters will power this F20T12 just in case it does need to be replaced?

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Sep 09, 2019 at 12:42 PM Author: nicksfans
FS-2 is the correct starter.

I like my lamps thick, my ballasts heavy, and my fixtures tough.

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Sep 09, 2019 at 01:08 PM Author: jercar954
Stuck starter or shorted capacitor is present. Try a new F-2 or FS-20 starter. The latter is a better starter as it shuts the lamp off at EOL protecting it and the ballast.

Preheat and T-12 fluorescents forever! Down with LED's and instant start T-8 fluorescents.

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Sep 09, 2019 at 01:58 PM Author: nicksfans
Yes, the GE "watch dog" and similar FS-20 starters are better, but you're probably not going to find one outside of eBay.

I like my lamps thick, my ballasts heavy, and my fixtures tough.

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Sep 09, 2019 at 06:24 PM Author: jercar954
I got a case of Hubbell FS-20s a few years ago on EBay for $12!

Preheat and T-12 fluorescents forever! Down with LED's and instant start T-8 fluorescents.

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Feb 22, 2020 at 09:32 AM Author: Cool white 79
Look how far that etch is from the end, looks cool...
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Feb 22, 2020 at 10:51 AM Author: Lightingguy1994
Try your preheat set up again. If it does not light and only glows at the ends, remove the starter while on and lamp should light. I agree its likely a stuck starter

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