Abstract
The paper gives an account of research work carried out in Czechoslovakia in the last 10 years. The problem of the economical rated voltage of incandescent lamps is analysed in general and the economical voltage derived for cases of varying mains voltage and cost of electrical energy. The attainable economy is critically evaluated.
The second part of the paper deals with the economical interval for maintenance and re-lamping and the method of its computation. Special attention has been paid to the investigation of the most favourable arrangement of fluorescent tubes for factory lighting and an attempt made to express the quality of illumination by a single “quality index” to enable a clear comparison of the individual arrangements.
A new type of fluorescent lantern for street lighting at low temperatures is described.
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