| In your first video, the starters glows an intensive blue color, means that they have a mystery gas in them.
Also, they severe overdrives the electrodes during the preheating, that may cause early failure.
In your last video, both tubes have reached EOL, because both of them strobing.
The good tube should be flash different then the bad one.
Generally, i'm not love the preheat blinkage of fluorescent lamps operated with glow starters (Especially if they're in a large number of lamps), and this is one reason why i more love electronic starters instead, or HF ballasts that have low loss and have no humming and have flicker free operation and starting.
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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.
