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Apparently you can run T5 tubes on a 40W circline ballast and it burns off end blackening.

Apparently you can run T5 tubes on a 40W circline ballast and it burns off end blackening.

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It seems to burn off end blackening... I'm not sure if this is actually good for the tubes or not...

PSX_20190213_101635.jpg PSX_20190207_224143.jpg PSX_20190207_101948.jpg PSX_20190207_100232.jpg

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Filename:PSX_20190207_101948.jpg
Album name:HomeBrewLamps / FLUORESCENT
Keywords:Lamps
File Size:482 KB
Date added:Feb 07, 2019
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dor123
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Feb 07, 2019 at 09:24 AM Author: dor123
The end blackening you see here, isn't because of sputtered emitter from the electrodes, but mercury that being condensed on the lamp ends and than evaporates. Run this T5 on its normal ballast for several hours to settle. Overdriving it on an F40 ballast, will short its life.

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 lives in Israel, which is a 230V, 50hz country.

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Feb 07, 2019 at 10:15 AM Author: RCM442
I love doing this with little CFL tubes and dor123 the blackening is burning off and I think becoming part of the arc stream. As end blackening isn't condensed mercury but emissive mix that has sputtered off the electrodes.

Linear fluorescent will never lose to LED!
I am not Anti-LED, as I have some in use at my house.
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dor123
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Feb 07, 2019 at 11:23 AM Author: dor123
This occurs also with my CFLs, and I think it is condensed mercury that evaporates, since it don't appears before lamp turning on.
You can see this phenomenon also in MV and MH lamps.

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 lives in Israel, which is a 230V, 50hz country.

xmaslightguy
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Feb 07, 2019 at 05:30 PM Author: xmaslightguy
Overdriveing the lamps really doesn't matter, but for the sake of the ballast, I wouldn't leave that running very long...

If its LPF, you're severely overdriving the ballast by running such a short lamp. It will overheat & thermal protection shut-down.
If its HPF, you may damage the capacitor by running a lamp so far off spec (not all ballasts have thermal protection on the capacitor either)

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

suzukir122
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Feb 08, 2019 at 02:10 PM Author: suzukir122
I've never seen end blackening that has occurred due to the lamp getting close to EOL, simply evaporate. I agree with Dor123. I've
seen mercury condensation evaporate as the lamp gets hotter and... that seems to be what is happening here. As time goes on,
the true end blackening will definitely occur with this set up... but this is NOT good for Rapid Start ballasts, at all. lol

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