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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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    The fluorescent fittings with a tungsten ballast lamp would usually start any lamp that would also start from a leakage transformer circuit, a semi resonant circuit, or from a transformer start circuit. They would not reliably start lamps intended for switch start fittings.

    Earthed metal close to the lamp helped.

    For non earthed lighting circuits, "artificial earth" units used to be available, these consisted a small 500 volt capacitor to be connected between mains neutral and the metal fitting. In premises previously equipped with gas lights and with the gas pipes still in place, a bit of wire between the metal fitting and the gas pipe also worked.


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    The fluorescent fittings with a tungsten ballast lamp would usually start any lamp that would also start from a leakage transformer circuit, a semi resonant circuit, or from a transformer start circuit. They would not reliably start lamps intended for switch start fittings.

    Earthed metal close to the lamp helped.

    For non earthed lighting circuits, "artificial earth" units used to be available, these consisted a small 500 volt capacitor to be connected between mains neutral and the metal fitting. In premises previously equipped with gas lights and with the gas pipes still in place, a bit of wire between the metal fitting and the gas pipe also worked.


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