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Fluorescent Fitting. How Long Has This Been Going On?

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I was relamping some old high level 5 foot fluorescent fittings today. The Thorn Popular Pack type of old. They were fitted with Atlas tubes. So, I was wondering, what is the oldest working fluorescent fitting that you have come across with a heavy wound magnetic ballast and fluorescent starter unit?


Z.


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    broadgage:


    I have seen fittings with no choke, a special filament lamp being wired in series with the tube. These special ballast lamps are no longer manufactured AFAIK.

     





    I seem to recall these also needed special tube. Although the filament lamp can act as a current limiter once the tube is running, it obviously can't give any inductive 'kick' to get the arc started so another mechanism is needed.
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  • 0

    broadgage:


    I have seen fittings with no choke, a special filament lamp being wired in series with the tube. These special ballast lamps are no longer manufactured AFAIK.

     





    I seem to recall these also needed special tube. Although the filament lamp can act as a current limiter once the tube is running, it obviously can't give any inductive 'kick' to get the arc started so another mechanism is needed.
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