| When I was testing my F6T5s and F4T5 lamps, I only ran them for 5 seconds. But in that short time, some of the brand new philips lamps got wear marks, as though they have been running for months. I used a philips electronic 4-6w heated cathode ballast.
This isn't mercury condensation. Usually for me, when running T5s for a short duration, the blackening is mercury condensation, which dissappears after a few minutes. But in these philips tubes, I have left them for a day, and they still have the blackening.
What is causing this, and is there a way to remove these marks? I am really disappointed to see brand new lamps getting wear marks so easily.
Below are images of the marks on a philips G4T5 and philips F6T5/BL
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