Abstract
IN accordance with the usual practice of the Illuminating Engineering Society at its opening meeting, a report on progress prepared by the Technical Committee and summarizing advances in lighting and photometry during the past year was presented, and a series of exhibits was arranged. Among the most striking of these was a new form of small electric discharge lamp (80 watt and 125 watt), produced by leading manufacturers in Great Britain. This lamp, which resembles in size and shape an ordinary filament lamp, is the first of the kind capable of being applied (with only a choke in circuit) on circuits of 200-250 volts (A.C.) for domestic and office use. These lamps have an initial efficiency of 40 lumens per watt and an average efficiency of 30 lumens per watt during life. Of considerable interest also were the demonstrations of the effect of bulbs coated with fluorescent powder, whereby the natural spectrum of the light can be considerably improved, and of various stroboscopic effects. Other exhibits included a model illuminated aerodrome and a model stage, improved forms of catalytic methods of ignition for gas burners, and a method of studying the brightness of illuminated roadways by the aid of accurate photographs taken by artificial light.
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Progress in Illumination. Nature 138, 715 (1936). https://doi.org/10.1038/138715c0
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DOI: https://doi.org/10.1038/138715c0