SIEMENS ELECTRIC LAMPS & SUPPLIES LTD., LONDON, E.C.4

Years of reseach and practical experience prior to 1939 resulted in lamps and equipment being designed and a technique of application being evolved which, when properly combined, produce excellent electric street lighting at reasonable cost. Today this well-established technique is still up-to-date and consequently radical changes in street lighting equipment have not, in recent years, been necessary. It follows that the equipment available for street lighting today is substantially the same as that produced in the immediate pre-war days.

Sieray Mercury and Sodium Vapour Electric Discharge and SIEMENS tungsten filament gas-filled lamps are available in suitable wattage ratings, whilst SIERAY-DUAL lamps meet the requirements of those authorities who wish to install electric discharge lamps on direct current supplies, those who favour the improved quality of the light emitted by these lamps, or where capital cost is important.

The application of SIERAY FLUORESCENT tubular lamps to street lighting is under consideration and it is felt that these lamps have a considerable potential value in important centres of large towns, where the colour of their light and low brighness are likely to be attractive.

With regard to lanterns, a new single-piece prismatic doem refractor has been designed and is used in a range of lanterns known as the NEWTON-SIERAY type, features in the design of which make a ready appeal.