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Calculate No of Street Light PoleJignesh.N.Parmar www.electricalnotes.wordpress.com
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Road Detail
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Type of Road: #B-18
Cutoff or semi-cutoff
7.5 To 9 Meter
0.88
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Design Vehicle Speed for Road50 Km/HrKm/Hr
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Width of the road (W): #7Meter
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Type of Pole Arrangement (F): #Single side1
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Height of the pole (H):6Meter
*Average Height of Pole as per Type of Road= 7.5 To 9 Meter
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*Minimum Height of Pole as per Road Width= 4.9 Meter
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Luminaire Detail:
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Type of fixture:Full Cutoff
*Type of Fixture as per Type of Road= Cutoff or semi-cutoff
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Type of Lamp:LED
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Rated Fixture Power:92Watt
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Lamp Lumen Output (LL): #9200Lumens
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Lux Required on Road: (Eh) #10Lux*Average Lux as per Type of Road=8 Lux
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Mounting Height of Fixture (H): #6Meter
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Pole distance from Road (SetBack) (C):0.5Meter*Average SetBack as per Vehicle Speed=0.8 Meter
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Light OverHang (B):0.5Meter
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Boom Length (L):1Meter*Average Boom Length as per Pole Height=0.5
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Boom Angle (Tilt Angle) (¢):10°*Tilt Angle Should be 5°,10°,15°
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Beam Angle of Fixtures: #120°*Beam Angle Should be 120° To 160°
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Coefficient of utilization (CU)0.2
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Lamp Lumen Depreciation Factor (LLD)0.72
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Luminaire dirt Depreciation Factor (LDD)0.88*LLD as per Type of Lamp=0.88
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Single side1Full Cutoff
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Results:Both Side Staggered1Cutoff
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Spacing between each Pole:17Meter*Average Spacing as per Type of Fixture= 18 MeterBoth Side Opposite2Semi-Cutoff
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Space Height Ratio:3*As per Type of Fixture Space Height Ratio= 3Twin central1Non-cutoff
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Illumination Diameter on Road:
13Meter
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Equations:
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Spacing between each Pole=(LL*CU*LLD*LDD*F) / Eh*W
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# Details Required
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