THE IMPACT OF CIE 140 ON STREETLIGHTING IN SOUTH AFRICA SEMINAR: Public Lighting Networks – How to reduce energy consumption: Eskom Convention Centre, Midrand: 03 March 2008
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Revisions to SANS 10098-1
Replace all references to C.I.E. 30.2 with C.I.E. 140
Replace reference to computer calculations with “All Windows based
street lighting calculation computer programs commercially available
to-day, using the methods given in CIE publication 140”
Replace reference to design methods with : “All design methods shall
be based on the calculation methods given in CIE 140”
Include a statement that design criteria given shall comply with the
calculation methods of CIE 140
Revised SANS 10098-1:2007 Edition 3.3
published late last year !
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Revisions to SANS ARP 035
• Clause 2.2 - Replace the 2nd paragraph with the following: "The calculation of lighting
values, as given in tables 1 and 2 of SANS 10 098-1, is achieved by using any reputable
Windows based commercially available street lighting computer program. Most
luminaire manufacturers have had their luminaires photometered by the SABS, or anyother accredited national or international laboratory, and can provide the designer/user
with an electronic data file of the luminaire's light distribution which can be used in these
computer programs. These electronic data files are normally generated from the source
data which is the intensity distribution tables, polar diagrams, etc, which the SABS will
provide in hard copy format. The designer/user can verify the integrity of the electronicdata file by comparing the intensity values at various horizontal and vertical angles in the
electronic data file to the intensity values of the corresponding angles in the hard copy
source data. This can be easily done with one of the many photometric analytical tools
which are also commercially available today."
• Clause 2.2.3 - Replace the 4th sentence with the following: "Tenderers should be
requested to submit their electronic data files, including the original source data in hard
copy format issued by the SABS, together with the actual designs in electronic format
which support their claims on the price schedule form, for verification by the end user."
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Revisions to SANS ARP 035
• Clause 2.4 - Replace the last sentence with: "All reputable Windows based street lighting
computer programs commercially available today have the option of printing out a table
of illuminance values of the final luminance design, in order to verify the design on site."
• Clause 4.3 - Replace the 3rd sentence with the follow: "This intensity table should be
converted by the SABS and/or luminaire supplier into a suitable electronic format for use
with any of the commercially available street lighting computer programs."
• Clause 5.6.2 - Delete the note that referred to the SABS 098 program at the bottom of the
paragraph.
Revised ARP 035:2007 Edition 2.3 published
late last year !
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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
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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 CIE 140 major improvement: all the
things that experience has revealed during the
past 20 years.
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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 Method of calculating TI has changed
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What are the most significant
changes ?
Luminous intensity data for
luminaires are reviewed: shorter
angular intervals for I-tables
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10° and 15°
steps
10° and 15°
steps
5° steps
5° steps 2.5° steps
2.5° steps10 and 5°
steps
Values of luminous intensities are required over the range of angular intervals
1° steps
Calculations will be more accurate, because we have more detailed information.
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I-TABLE SCANNED ACCORDING
TO C.I.E. 30.2
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I-TABLE SCANNED ACCORDING
TO C.I.E. 140
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What are the most significant
changes ?
Interpolation methods for I-tables and
r-tables are reviewed and more
completely developed
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Interpolation of luminous intensitydata
Linear Interpolation
C C C m m+1
j+1
j
In the case of I, where we have measured values
in shorter angular intervals.
C C C m m+2
j+1
j
j+2
C m+1
Quadratic Interpolation
In the case of I, where we have measured
values in wider angular intervals.
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What are the most significant
changes ?
Calculation grids for both luminance
and illuminance are changed
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S
D
D≤≤≤≤5m, N=10D=S/N
CIE 30.2
S
D
D/2
D≤≤≤≤3m, N=10D=S/N
CIE 140
For Luminance calculation
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Before S = 50 m. Now S = 30 m.
D/2
For luminance calculations
x
x
x
x x xx x xx x x
Wl d =Wl /3
d /2
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For Luminance calculation
W
W/4 Wt/2
WtWt/2
h=1,5m
60m
CIE 30.2 CIE 140
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o : observer for Lave and Uo
x : observer for UL
ooo
oo
o
oo
T h e L
a v e a n
d U o r e t a i
n e d a r e
t h e l
o w e s t
o n e s o f
t h e
t h r e
e l a n
e s
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What are the most significant
changes ?
Method of calculating TI has changed
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TI Calculation
(%)28.0 Θ⋅
⋅= Θ
ave L
E k TI
Before, k = 650
Now we can take the observer age into account
+⋅=
4
4.661641 Age
k
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TI Calculation – SHOULDWE CHANGE THE AGE?
• In the CIE 140, there is indeed the possibility tochange the age of observer.
• The initial value of K corresponds to an age of 23years.
• In practice, nobody "plays" with that possibility. Whichage would be more convenient ?
• Why 23 years has been chosen ?
• Finally, nobody cares about that and we all continue
to use the "default" value of 23 years. Indeed, whatargument could be found to change that ?
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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 samein number and distance as are used for the longitudinal
spacing D of luminance calculation points.
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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
l
v
l
l(m) v(m)
2.5m 0.5m
57m
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Results
79.942.02.33
77.740.02.59
0.4634.111.882.440.12.8257CIE 140
0.4227.612.279.440.22.2860CIE30.2
UoeETIUlUoLS
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Practical implications
• No more SABS 098 program for streetlighting calculations
• Slightly shorter spacings in some cases
• 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
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Conclusion
• Software packages compatible with CIE140 include:-
• ULYSSE
• RELUX
• AGI32
•