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THE IMPACT OF CIE 140 ON STREETLIGHTING IN SOUTH AFRICA

THE IMPACT OF CIE 140 ON STREETLIGHTING IN SOUTH AFRICA. AUTHOR:- MURRAY CRONJE, BEKA (PTY) LTD. AMEU CONVENTION: DURBAN: 14-17 OCTOBER 2007. The CIE 140..., what for ?. To update and replace CIE 30.2 (1982), Calculation and measurements of illuminance and luminance in road lighting

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THE IMPACT OF CIE 140 ON STREETLIGHTING IN SOUTH AFRICA

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  1. THE IMPACT OF CIE 140 ON STREETLIGHTING IN SOUTH AFRICA AUTHOR:- MURRAY CRONJE, BEKA (PTY) LTD AMEU CONVENTION: DURBAN: 14-17 OCTOBER 2007

  2. The CIE 140..., what for ? • To update and replace CIE 30.2 (1982), Calculation and measurements of illuminance and luminance in road lighting • It gives the methods which CIE 115 (1995) and CIE 136 (2000) require for their recommendations

  3. Was there a real need to update CIE 30.2? YES CIE 30.2 came out just after the luminance concept was accepted: there was very little experience with it. And this is the CIE 140 major improvement: all the things that experience has revealed during the past 20 years.

  4. What are the most significant changes ? • Road surfaces characteristics are not dealt with any more in this document • Luminous intensity data for luminaires are reviewed: shorter angular intervals for I-tables • Interpolation methods for I-tables and r-tables are reviewed and more completely developed • Calculation grids for both luminance and illuminance are changed • New observer for TI

  5. 10° and 15° steps 5° steps 10° and 15° steps 5° steps 2.5° steps 2.5° steps 10 and 5° steps 1° steps Values of luminous intensities are required over the range of angular intervals Calculations will be more accurate, because we have more detailed information.

  6. Interpolation of luminous intensity data Linear Interpolation Quadratic Interpolation In the case of I, where we have measured values in shorter angular intervals. In the case of I, where we have measured values in wider angular intervals.

  7. For Luminance calculation S S D D D/2 CIE 30.2 CIE 140 D=S/N D5m, N=10 D=S/N D3m, N=10

  8. For luminance calculations Before S = 50 m. Now S = 30 m. D/2 x x x x x x x x x x x Wl d =Wl/3 x d /2

  9. For illuminance calculations Before S = 50 m. Now S = 30 m. d/2 x x x x x x x x x x x Wr/3 x Wr standing for “Width of relevant area”

  10. For Luminance calculation h=1,5m 60m CIE 30.2 CIE 140 Wt/2 Wt W W/4 Wt/2

  11. o : observer for Lave and Uo x : observer for UL o o o The Lave and Uo retained are the lowest ones of the three lanes o o o o o

  12. TI Calculation Before, k = 650 Now we do take the observer age into account

  13. TI calculations 2,75 (H-1,5m) Before - only one observer position for TI calculations Now - observer in the initial position and repeated with the observer moved forwards in increments which are the same in number and distance as are used for the longitudinal spacing D of luminance calculation points.

  14. Example - highway - 3 traffic lanes (Wt=3,5m), central reservation (5.5m) - class A1 (SANS10098-1), Lav(2cd/m2), Uo(40%), Ul(70%), TI (15%) - central pole position, H=13m, overhang 0m - class R3, Qo=0,07 - BEKASTRADA SUPRA 400W HPS/T 57m

  15. Results

  16. Practical implications • No more SABS 098 program for street lighting calculations • Slightly shorter spacings • No more encrypted data • SABS to change their measurement methods • Municipalities to change their specifications to exclude references to ;- • Data on 3.5 inch diskettes • Encrypted data • Designs to be done with SABS 098 program

  17. Conclusion • RSA now in line with the rest of the world • Street lighting calculations now more accurate ensuring greater safety for motorists • Users and suppliers now have a choice of which software to use

  18. Thank you for your attention !

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