THE MANAGEMENT OF A LOW-PRESSURE SODIUM INSTALLATION

This paper describes how Hertfordshire County Council sought to obtain better value for money in their street lighting and maintenance costs without any decrease in overall standard. A long term aim of standardisation of light sources was decided with predominant use of low-pressure sodium lamps. 75,000 out of a total of 95,000 lights are now of this type and details are given of the savings achieved. A computer system installed in 1978 has monitored the performance of bulbs and information relating to lamp life and comparisons with high pressure sodium lamps is given. Factors affecting light output depreciation are also considered. The economics of maintenance operations are examined and the various options available listed. Hertfordshire opted for bulk change with selected lamps recovered for use for random replacements. Formulae are derived for calculating overall annual costs for this method and for a random replacement policy. Optimum bulk change cycles are calculated and compared for various types of lamp. The author concludes that low pressure sodium lamps offer the best solution to street lighting with bulk changing at the most economical period acceptable.

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  • Corporate Authors:

    INSTITUTION OF LIGHTING ENGINEERS

    LENNOX HOUSE, 9 LAWFORD RD
    Rugby, Warwickshire,   United Kingdom 
  • Authors:
    • Zuman, N
  • Publication Date: 1989-12

Language

  • English

Media Info

  • Pagination: p. 222-225
  • Serial:
    • LIGHTING JOURNAL
    • Volume: 54
    • Issue Number: 4
    • Publisher: INSTITUTION OF LIGHTING ENGINEERS
    • ISSN: 0950-4559

Subject/Index Terms

Filing Info

  • Accession Number: 00606543
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Mar 31 1991 12:00AM