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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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    I did some experiments with 2 and 4 foot tubes starting them with a filament lamp as ballast instead of a choke it worked really well starting was a bit slower and the tubes didn't run as brightly as with the proper choke  anything bigger than 4 foot just didn't want to know. If anyone wants to try it I found a 100 watt filament lamp is needed for a 20 watt tube measuring power consumption showed around 28 watts with the tube nicely warmed up.
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    I did some experiments with 2 and 4 foot tubes starting them with a filament lamp as ballast instead of a choke it worked really well starting was a bit slower and the tubes didn't run as brightly as with the proper choke  anything bigger than 4 foot just didn't want to know. If anyone wants to try it I found a 100 watt filament lamp is needed for a 20 watt tube measuring power consumption showed around 28 watts with the tube nicely warmed up.
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