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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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    For a single 2 foot, 20 watt tube, a good approximation of the correct tungsten lamp is a 196 volt, 100 watt lamp. These are still available.

    For a single 4 foot 40 watt tube the correct series tungsten lamp is about 150 volts, 75 watts or 160 volt, 80 watts. No longer readily available.

    Five foot, 65/80 watt tubes were not often operated on tungsten ballasts but can be used with a parallel pair of 150 volt, 75 watt tungsten lamps.


    Only the T12 argon filled lamps will start reliably on such circuits.


    The miniature 12 inch 8 watt tubes work fine in series with a tungsten ballast. 10 bulbs in series, each being 20 volt 3 watt works well. (old type Christmas lights)


    Mercury vapour lamps can also be run in series with tungsten ballast lamps. A pair of mercury vapour lamps and a single 240 volt filament lamp will work, all three in series from a 415 volt circuit. The efficiency is greater than with tungsten lamps only, and the colour rendering is better than with only mercury lamps.
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  • 0
    For a single 2 foot, 20 watt tube, a good approximation of the correct tungsten lamp is a 196 volt, 100 watt lamp. These are still available.

    For a single 4 foot 40 watt tube the correct series tungsten lamp is about 150 volts, 75 watts or 160 volt, 80 watts. No longer readily available.

    Five foot, 65/80 watt tubes were not often operated on tungsten ballasts but can be used with a parallel pair of 150 volt, 75 watt tungsten lamps.


    Only the T12 argon filled lamps will start reliably on such circuits.


    The miniature 12 inch 8 watt tubes work fine in series with a tungsten ballast. 10 bulbs in series, each being 20 volt 3 watt works well. (old type Christmas lights)


    Mercury vapour lamps can also be run in series with tungsten ballast lamps. A pair of mercury vapour lamps and a single 240 volt filament lamp will work, all three in series from a 415 volt circuit. The efficiency is greater than with tungsten lamps only, and the colour rendering is better than with only mercury lamps.
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