Strange color from EOL fluorescent « on: May 21, 2025, 07:35:14 AM » Author: LightsAreBright27
I had a cool daylight 14w T5 that was eol, so I roasted it on an instant start ballast. But after the eol show the tube dimmed and glowed blue. The blue light was similar to BL colour. It only lights up with a tesla coil now. Compared to a normal 20w tube in picture.
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Holder of the rare F10T12/BL Preheat Fixture here!
Also known as LAB27 for short.
245v 50Hz

	Re: Strange color from EOL fluorescent « Reply #1 on: May 21, 2025, 08:39:04 AM » Author: dor123
Lamp probably got contaminated.
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	Re: Strange color from EOL fluorescent « Reply #2 on: May 21, 2025, 09:23:28 AM » Author: LightsAreBright27
Here's a similar one. A 36w pll lamp. This one atleast glows on the ballast. But one electrode glows orange.
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Holder of the rare F10T12/BL Preheat Fixture here!
Also known as LAB27 for short.
245v 50Hz

	Re: Strange color from EOL fluorescent « Reply #4 on: May 23, 2025, 04:32:55 AM » Author: LightsAreBright27
The 14w tube ran with a bright orange cathode. Then half of the tube became orange, and then turned off. There was a slight glow on the other electrode, but the lamp couldn't turn on. I got it to glow blue from a tesla coil.
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Holder of the rare F10T12/BL Preheat Fixture here!
Also known as LAB27 for short.
245v 50Hz

	Re: Strange color from EOL fluorescent « Reply #5 on: May 23, 2025, 05:43:25 AM » Author: dor123
The cathode may be broken and an arc formed between the two ends of the filament, and burning it through the glass stem and turning orange, finally causing vacuum loss.
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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 international date format (dd.mm.yyyy).

I lives in Israel, which is a 220-240V, 50hz country.