THE ACCURACY OF THE IES GLARE INDEX SYSTEM

A NEW COMPUTER PROGRAM FOR CALCULATING INITIAL GLARE INDICES HAS THE ADVANTAGE OVER THE ORIGINAL PROGRAM USED BY THE IES OF CALCULATING THE BACKGROUND LUMINANCE AS WELL AS THE OTHER ELEMENTS IN THE GLARE FORMULA. DISCREPANCIES BETWEEN THE IES AND THE NEW PROGRAMS HAVE BEEN FOUND. THESE APPEAR TO BE DUE TO AN ERROR IN THE GLARE FORMULA USED IN THE IES COMPUTER PROGRAM AND TO A MISINTERPRETATION OF THE JONES-NEIDHART METHOD FOR CALCULATING THE ILLUMINATION ON WALLS. DIFFICULTIES RELATED TO LUMINOUS AREAS AND THE APPLICATION OF POSITION INDICES ARE DISCUSSED. THE EFFECT OF SPACING WITH ARRAYS OF LUMINAIRES IS INVESTIGATED. THE MAGNITUDES OF THE LIKELY DISCREPANCIES BETWEEN THE GLARE INDICES CALCULATED BY THE IES GLARE INDEX TABLES AND BY THE BRS GLARE FORMULA ARE SUMMARIZED. AS IN MANY RESPECTS THE IES GLARE SYSTEM IS A CLOSED SYSTEM; LIGHTING INSTALLATIONS SO FAR DESIGNED USING IES TECHNICAL REPORT NO. 10 WILL, WITH MINOR EXCEPTIONS, BE SATISFACTORY. /HSRI/

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00243426
• Authors:
  • Bedocs, L
  • SIMONS, R H
• Publication Date: 1972

Media Info

• Features: References; Tables;
• Pagination: p. 80-9
• Serial:
  • Lighting Research and Technology
  • Volume: 4
  • Issue Number: 2
  • Publisher: Sage Publications Limited
  • ISSN: 1477-1535
  • Serial URL: http://lrt.sagepub.com/

Subject/Index Terms

• TRT Terms: Computer programs; Glare; Illuminating engineering; Luminaires; Street lighting
• Old TRIS Terms: Illumination engineering
• Subject Areas: Highways; Safety and Human Factors;

Filing Info

• Accession Number: 00221879
• Record Type: Publication
• Source Agency: Highway Safety Research Institute
• Files: TRIS
• Created Date: Apr 23 1973 12:00AM