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GE Mainlighter Fluorescent Tube

GE Mainlighter Fluorescent Tube

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This is one of two fluorescent tubes that act as accent lighting over the glass doors to the back deck at the new house. This one is burnt out and the other one is flickering and close to going out too. I've never seen a GE Mainlighter tube before. These both measure 48 inches. I think it's a T12 style bulb. I hope to replace them with warm white GE EcoLux or Watt Misers or Philips Altos.

IMG_6045.JPG IMG_5793.JPG IMG_5600.JPG image.jpeg

Light Information

Light Information

Manufacturer:General Electric
Electrical
Wattage:40 Watts
Voltage:120 Volts
Physical/Production
Factory Location:USA
Application/Use:Kitchens, shops, offices, or anywhere efficient and bright light is needed

File information

File information

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Filename:IMG_5600.JPG
Album name:CEB1993 / Fluorescent Lights
Keywords:Lamps
File Size:282 KB
Date added:Jun 19, 2017
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Date Time:2017:06:17 16:23:36
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DieselNut
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John


jonathon.graves johng917 GeorgiaJohn
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Jun 20, 2017 at 06:38 AM Author: DieselNut
Be sure to replace them with full power 40 watt, not the 34 watt junk.

Preheat Fluorescents forever!
I love diesel engines, rural/farm life and vintage lighting!

streetlight98
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Mike McCann


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Jun 20, 2017 at 11:05 AM Author: streetlight98
It is a T12 and yes, use 40W bulbs. Stick with GE too if you can. FYI the "T5, T8, T12" thing comes from how many eights-of-an-inch the tube is in diameter. A T5 is 5/8" thick. A T8 is 8/8" (1") thick. A T12 is 12/8" (1.5" thick). A T17 is 17/8" thick, or just over 2".

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Jun 20, 2017 at 11:10 AM Author: Powell
Short end blackening on these.

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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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Jun 20, 2017 at 04:52 PM Author: nicksfans
Yeah, don't use Watt Misers or anything that's not 40w.

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

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Jun 20, 2017 at 06:27 PM Author:
It looks like it was suffering from loss of vacuum or violent eol show
DieselNut
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jonathon.graves johng917 GeorgiaJohn
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Jun 20, 2017 at 06:53 PM Author: DieselNut
Short electrode stem (early Mainlighter?)

Preheat Fluorescents forever!
I love diesel engines, rural/farm life and vintage lighting!

don93s
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Jun 20, 2017 at 08:57 PM Author: don93s
This looks to have been either removed shortly after EOL, quick vacuum loss, or was in a preheat. What sort of ballast? Typically, the longer a lamp like this stays flickering/glowing dim on a magnetic rapid-start, the longer the black 'sock' grows. Even as the lamp glows dim or rectifies, it continues to sputter electrode material onto the glass.
RyanF40T12
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Jun 20, 2017 at 09:08 PM Author: RyanF40T12
Naah. This one had an electrode closer to the cap vs father out in which you would get longer banding. I have a short stemmed GE myself and the rest are long.

The more you hate the LED movement, the stronger it becomes.

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Jun 20, 2017 at 09:15 PM Author: don93s
Yeah, that is definitely a factor but I've been messing around with these older mainlighters with short electrodes since 1979. They can get a much darker and longer sock than the one shown above.
DieselNut
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jonathon.graves johng917 GeorgiaJohn
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Jun 20, 2017 at 10:11 PM Author: DieselNut
I just had a GE Spec 65 go on a violent EOL in my shop. It quickly grew a dark black sock and was rectifying on a 3x40 preheat ballast. The starter never tried to re strike it, despite starting it like normal (even after tube replacement later). It was used when I stuck it and two similar tubes in the fixture back in 2006 when I built/wired my shop. I was shocked how quickly the tube fried and died. I was working on equipment and noticed a change in the lighting, looked up and saw it rectifying with an orange flashing swirl like a F96T12 does at EOL. It calmed down and later was dead, with an awesome dark "sock". I threw a used Philips F40DX ALTO in its place to make sure everything still worked fine and it has been going well for three days (evenings).

Preheat Fluorescents forever!
I love diesel engines, rural/farm life and vintage lighting!

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Jun 21, 2017 at 08:16 AM Author: don93s
@DieselNut, That's pretty cool. Occasionally, I guess PH lamps can have quite an EOL, though most go out without much action. Depends on the ballast and lamps...as even lamps themselves can vary at EOL on a given ballast. The ones I usually see just start blinking with a moderately dark end like above. I have seen them get a bit of orange discharge swirl on the lead-side before they go out for good after severing the filament.
RyanF40T12
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Jun 21, 2017 at 11:26 AM Author: RyanF40T12
Stick it on a T8 Instant Start and enjoy the death dance show.

The more you hate the LED movement, the stronger it becomes.

CEB1993
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Camden


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Jun 21, 2017 at 08:27 PM Author: CEB1993
Thank you for all the help I don't have much experience with fluorescent tubes, but now I know what to replace them with. T12 40 watts by GE.

Philips DuraMax and GE Miser forever!  Classic incandescents are the best incandescents!

Stop the lamp bans!

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Jul 31, 2017 at 02:38 PM Author: Powell
My 1950s preheater will give a VIOLENT EOL on the lead lamp. It will fling the glowing orange filament off to the glass and <TINK ! > SSSSSSSSS

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zzz


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Jul 31, 2017 at 07:35 PM Author: xmaslightguy
Some of these old GE's will get a nice long, deep black end if left EOL on a RS ballast for some time (LPF ballast would do good for this )

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