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"The High-Pressured Sodium Lighted Street Lightings Effects on Lighting and Economy at Pécs"
György BORKOVITS
South-West Hungarian Electricity Plc (DEDASZ), Hungary
Abstract
The some 2000-year old Pécs in rich of historical and architectural monuments. Pécs is the third largest city in Hungary, with approximately 200,000 inhabitants. In this way to develop the public lighting of streets and roads always meant serious task for the experts.
The installation of the public lighting operating from electric network in Pécs began in 1924. Since that time the development was speedy and significant. The evolution was substantial especially from the end of 50´s, during the application of the fluorescent lamps in public lighting. This type of lamp replaced the tungsten filament lamps on the public lighting networks, which were applied generally and uniformly until that time. The fluorescent lamp brought significant development into the illuminating engineering, since its light utilization is better and has longer lifetime then the normal lamps. The next great step was in the development the substantial and rapid spreading and application of the mercury-vapour lamps in the public lighting in the 60´s.
Nowadays we can see the greatest development, which is the most significant in the history of the evolution of the public lighting. It is the general application of the energy efficient high-pressure sodium lamp in the public lighting. The appearance of this type of lamp began in Hungary, and also in Pécs, at the end of 70´s and at the beginning of 80´s. At first it was used to illuminate zebra crossings, and later to illuminate pedestrian zones an walking streets. Up to 1985 we used high-pressure sodium lamps to illuminate several streets, situated on the area of centre of city. The public lighting of the new districts and the whole area of centre of town has been created in this way, too. After that we wanted to modernize the existing mercury lamp system, because of the energy efficiency and energy conversation. We used high-pressure sodium lamps.
In this way we decreased the installed capacity of the public lighting in Pécs, and the operational costs significantly. At the same time the illumination level of the streets and roads remained on the same level. In my presentation I would like to introduce the modernization of the public lighting in Pécs ( after the old mercury-lamp and the high-pressure sodium lamp modernization), and the economical analyses connecting to this.
In 1974 DEDASZ (South Hungarian Electricity) its study ?The Modernisation of Public Lighting in Pécs from 1975 to 1980?. We conducted an examination on the whole area of the town to assess the demand for modernisation which appeared during the working out of the study and to identify what is to be done. During the examination the aim was to achieve the lighting level required in the standard based on the data coming from the classification of roads in accordance with the traffic requirements. In the period between 1975 - 1980 DEDASZ Electricity conducted significant modernisation of the public lighting system in about 40 streets. In the last year of the plan period the high pressure sodium lamp ( put into operation in December 1980. ) (in ball shape lampcases ) street lighting was installed in a walking street called Ferencesek Street ( former Sallai Street ). The atmosphere of this lamp is suitable for a walking street: it had been the first sodium lamp street lighting at DEDASZ Electricity. From the 1980s the installation of sodium lamps in the Downtown was fastened up, the most significant part of this work was the building up of modern lighting system in Széchenyi Square. The building up or the re-building of high pressure sodium lamp lighting system was started in other areas of the town beside the Downtown.
In order to decrease continuously increasing electricity bill of Pécs´s street lighting the Pécs organisation of the MME ( Hungarian Electrotechnical Organisation ) prepared the study ?The Examination of the Development of Public Lighting in Pécs? for the Pécs Town Council's Executive Committee in November, 1987.
In the study we suggested that the problem of the town´s street lighting should be solved with the big scale installation of sodium lamps.
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