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Mercury migration again on 20 watt circline

Mercury migration again on 20 watt circline

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This is the second tube that has done mercury migration in this little 20 watt "Killerwatt Corp" preheat adapter with FC6T9 20 watt tube. It is hard to tell in the photo but the darkened end is only about 1/4 as bright as the non darkened end.

20181103_185334.jpg 20181005_171013.jpg 20180925_191300.jpg 20180726_231932.jpg

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Filename:20181103_185334.jpg
Album name:DieselNut / Preheat Fluorescents
Keywords:Lamps
File Size:164 KB
Date added:Nov 05, 2018
Dimensions:1848 x 2464 pixels
Displayed:100 times
Date Time:2018:11:03 18:53:34
DateTime Original:2018:11:03 18:53:34
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Exposure Time:1/120 sec
FNumber:f 1.7
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Focal length:4.2 mm
ISO:100
Make:samsung
Model:SM-G930V
Software:G930VVRS4CRI1
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ace100w120v
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Nov 05, 2018 at 07:24 PM Author: ace100w120v
Check that out! Are you going to leave it like this until it fails completely?
DieselNut
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jonathon.graves johng917 GeorgiaJohn
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Nov 08, 2018 at 02:58 PM Author: DieselNut
I think it has a broken filament/cathode now. It is on a photocell and only comes on every few evenings now. Only a very faint glow on the non burnt end.

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

ace100w120v
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Nov 08, 2018 at 04:09 PM Author: ace100w120v
And it didn't just flash in perpetuity?
DieselNut
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jonathon.graves johng917 GeorgiaJohn
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Nov 08, 2018 at 04:14 PM Author: DieselNut
Nope. Starts right up and rectifies

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

ace100w120v
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Nov 08, 2018 at 04:42 PM Author: ace100w120v
So either it gets a partial discharge at one end or just rectifies eh? I'm trying to understand its behavior...LOL
DieselNut
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jonathon.graves johng917 GeorgiaJohn
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Nov 08, 2018 at 09:54 PM Author: DieselNut
Yea that is correct. This thing is unique. This is the second time it has done this and with the second tube and second starter.

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

ace100w120v
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Nov 08, 2018 at 11:07 PM Author: ace100w120v
What was the end result the first time? Did the starter finally stick? Did the lamp or starter finally give up to the point it went dark permanently, never to light again without intervention/relamping? How long did you leave it?

I'm the type that loves to see how long EOL modes will continue and what they turn into, but the other part of me replaces lamps/ballasts/starters ASAP.
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jonathon.graves johng917 GeorgiaJohn
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Nov 09, 2018 at 07:03 AM Author: DieselNut
It did the exact thing with the first lamp. It rectified a while, migrated each time and then a filament broke so it could no longer preheat and start. This one has now gotten to that point. I need to start putting the date installed on my tubes and starters but it has been at least two years of nightly service. Going to replace it this weekend.

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

dor123
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Nov 09, 2018 at 07:34 AM Author: dor123
Mercury migration on preheat, can only occur, if the glow starter contacts don't closes by the rectification current, so the lamp rectify for sufficiently long time to allow the mercury to migrate from the bad electrode to the good one.
And when the electrode breaks, if you turn off and back on the lamp, you should see a glow discharge at the bad electrode like this .

I"m don't speak english well, and rely on online translating to write in this site.
Please forgive me if my choice of my words looks like offensive, while that isn't my intention.

I only working with the European date format (dd.mm.yyyy).

I hope that LED won't replace all forms of other light

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jonathon.graves johng917 GeorgiaJohn
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Nov 09, 2018 at 07:56 AM Author: DieselNut
@Dor123, that is exactly what this one has done. It does still occasionally light and will then rectify and migrate. The filament is severed but not completely broken off so it will still start sometimes.

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

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