This Technical Report has been prepared by CIE Technical Committee 4-15 of Division 4 “Lighting and Signalling for Transport” and has been approved by the Board of Administration of the Commissio...Full description
Descripción: This Technical Report has been prepared by CIE Technical Committee 4-15 of Division 4 “Lighting and Signalling for Transport” and has been approved by the Board of Administration of the Commissio...
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lightingFull description
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The objectives of competent narrative lighting.Descripción completa
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LIGHTING ILLUMINATION CALCULATION ROAD LIGHTING
1.0
INTRODUCTION
This Document covers the basic calculations to calculate the distance between the street lighting poles.
2.0
GENERAL
Road lighting calculations are done as per the average illuminance or illuminance criteria on the road surface.
The lighting calculations are done based on Philips software (CalcuLuX Road Ver 7.6.2.0). These calculations are performed for Single Carriageway, using 250W HPSV Lamp SGP100 type. As per BS 13201-1 & 13201-2, considered design parameters are
Lave
≥ 1.0 cd/m2
(Lmin/Lave)
≥ 0.4
UL(Luminance)
≥ 0.5
TI(Glare)
< 15 %
SR(Surround
≥ 0.5
Ration)
CalcuLuX is used for investigating the visibility level of a target on the road surface. This software calculates the target luminance, background luminance and the threshold of that target. Illuminance levels, uniformity and glare values on the surface of the road. The calculations are performed by considering high Pressure sodium Luminaire designed SGP100 1xSON-TPP250W.
The road model considered here is: Road arrangement
: Single Carriageway
Road width
: 3.5 M
Number of lane
: 1
Spacing
: 19 M
Mounting height
:
8M
(The lighting pole shall be mounted on the side of the pipe rack not from the ground) Tilt angle
:
5 Deg
The average illuminance reflects the general luminance level at which the driver performs. At the low level of lighting used for road lighting, performance improves with luminance in terms of increasing contrast sensitivity, increasing visual acuity and amelioration of glare.
At the same time overall and longitudinal uniformity values are obtained between the recommendation values as given CIE-115 [2]. Luminaire spacing parameter affects the visibility level. When the necessary overall and longitudinal uniformity values are obtained, the sufficient visual conditions in the road lighting can be created with the longer spacing. As a result of this using less Luminaire and consuming less energy better lighting conditions can be attained.
3.0
ILLUMINATION LEVELS
As per the design basis for Road Lighting general Lux requirement is 5.
4.0
TYPICAL CALCULATIONS – ROAD LIGHTING
The calculations presented below show Summary, Luminaire Information (Including Polar and Cartesian diagram); detailed information about the calculation results (in textual table, graphical presentation), Overview of schemes.
Type of fixture considered
=
250W Watt Street Light Luminaire
Lumen Output of the Lamp (LL)
=
33200 lumens
Lux Required
=
5
Width of the road (W)
=
11.48 feet (3.5 M)
Height of the pole (H)
=
26.24 feet (8 M)
Coefficient of utilization (CU)
=
0.18
Lamp Lumen Depreciation Factor (LLD)
=
0.8
Luminaire dirt Depreciation Factor (LDD)
=
0.9
Luminaries Spacing
=
LL*CU*LLD*LDD Eh*W
=
(33200*0.18*0.9*0.8) (5*11.48)
=
5.0
75 feet (23 Meters)
RECOMMENDATIONS:
Based on Calculations spacing between Light poles
: 23 M
Based on Simulation report (Phillips Calculux 7.6.2.0) average Lux achieved is
: 6.7
Hence 19 Meter spacing between Light poles is recommended.
