An improved technology for the production of fluorescent lamps is described. Coated glass tubes after passing through a baking lehr are loaded, while still hot, onto a single machine equipped with multi-function heads. The machine completes the cycle of sealing, exhausting, cathode conversion, argon filling and tip-off. Mercury is then dosed in the sealed lamp by the high frequency heating of a special cathode shield coated on one side with a mercury releasing alloy and on the other with a getter which acts during the lamp life to absorb impurities released. The optimisation of the argon flushing process is discussed using a mathematical model. Advantages offered by the new process are described.
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