SON SETS A NEW STANDARD

High efficiency and a long working life have led to the increased use of the high pressure sodium lamp (son) in the field of exterior lighting. Also the net trade price of the son lamp has steadily reduced compared with that of the low-pressure sodium lamp (sox). Recent developments of the efficacy of the son lamp have made it a serious challenger to the sox for group a lighting, and the life of a son lamp is shown to be 16000 hours, twice that of the sox. The present range of high-pressure sodium lamps, 70w, 150w and 250w will enable any scheme from 5 M to 12 M to be planned to meet code of practice recommendations. The acceptable colour and increased efficiency of the son lamp has led to its use in the replacement of high-pressure mercury and fluorescent tubes in city centres. The colour discrimination increases safety and assists in the prevention of crime. Savings in inventory charges should be possible because only two types of lantern need to be stocked. Future developments outlined make it probable that the son lamp will gradually supersede the present ranges of filament and mercury lamps. (TRRL)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00396303
• Corporate Authors:

  IPC Building and Contract Journals Limited

  Surrey House, 1 Throwley Way
  Sutton, Surrey SM1 4QQ,   England 
• Publication Date: 1981-12-17

Media Info

• Features: Figures; Photos;
• Pagination: p. 16-17
• Serial:
  • SURVEYOR
  • Volume: 158
  • Issue Number: 4670
  • Publisher: Hemming Group, Limited
  • ISSN: 0039-6303

Subject/Index Terms

• TRT Terms: Alternatives analysis; Central business districts; Color; Costs; Durability; Economic efficiency; Lanterns; Lighting columns; Pressure; Safety; Savings; Sodium; Sodium vapor lamps; Street lighting
• Uncontrolled Terms: Efficiency; High pressure
• Old TRIS Terms: Low pressure; Sodium lamps
• ITRD Terms: 6784: Colour; 224: Cost; 5910: Durability; 5911: Efficiency; 516: Lantern; 545: Lighting (street); 527: Lighting column; 5412: Pressure; 1665: Safety; 7197: Sodium; 311: Town centre
• Subject Areas: Design; Economics; Finance; Highways; Safety and Human Factors; I85: Safety Devices used in Transport Infrastructure;

Filing Info

• Accession Number: 00349583
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD, TRIS
• Created Date: Jul 30 1982 12:00AM