Calculate Street Light Pole’s Distance / Fixture Watt / Lighting Area
June 2, 2014 21 Comments
(1) Calculate Distance between each Street Light Pole:
Example: Calculate Distance between each streetlight pole having following Details,
 Road Details: The width of road is 11.5 Foot.
 Pole Details: The height of Pole is 26.5 Foot.
 Luminaire of each Pole: Wattage of Luminaries is 250 Watt, Lamp Out Put (LL) is 33200 Lumen, Required Lux Level (Eh) is 5 Lux, Coefficient of Utilization Factor (Cu) is 0.18, Lamp Lumen Depreciation Factor (LLD) is 0.8, Lamp Lumen Depreciation Factor (LLD) is 0.9.
 Space Height Ratio should be less than 3.
Calculation:
 Spacing between each Pole=(LL*CU*LLD*LDD) / Eh*W
 Spacing between each Pole=(33200×0.18×0.8×0.9) / (5×11.5)
 Spacing between each Pole= 75 Foot.
 Space Height Ratio = Distance between Pole / Road width
 Space Height Ratio = 3. Which is less than define value.

Spacing between each Pole is 75 Foot.
(2) Calculate Street Light Luminaire Watt:
Example: Calculate Streetlight Watt of each Luminaire of Street Light Pole having following Details,
 Road Details: The width of road is 7 Meter. Distance between each Pole (D) is 50 Meter.
 Required Illumination Level for Street Light (L) is 6.46 Lux per Square Meter. Luminous efficacy is 24 Lumen/Watt.
 Maintenance Factor (mf) 0.29, Coefficient of Utilization Factor (Cu) is 0.9.
Calculation:
 Average Lumen of Lamp (Al) = 8663 Lumen.
 Average Lumen of Lamp (Al) =(LxWxD) / (mfxcu)
 Average Lumen of Lamp (Al)= (6.46x7x50) / (0.29×0.9)
 Average Lumen of Lamp (Al)=8663 Lumen.
 Watt of Each Street Light Luminar = Average Lumen of Lamp / Luminous efficacy
 Watt of Each Street Light Laminar = 8663 / 24

Watt of Each Street Light Luminaire = 361 Watt
(3) Calculate Required Power for Street Light Area:
Example: Calculate Streetlight Watt of following Street Light Area,
 Required Illumination Level for Street Light (L) is 6 Lux per Square Meter.
 Luminous efficacy (En) is 20 Lumen per Watt.
 Required Street Light Area to be illuminated (A) is 1 Square Meter.
Calculation:
 Required Streetlight Watt = (Lux per Sq.Meter X Surface Area of Street Light) / Lumen per Watt.
 Required Streetlight Watt = (6 X 1) / 20.

Required Streetlight Watt = 0.3 watt per Square Meter.
Your sincere effort and goodwill contribution are to be thanked at all times.
Paneer Selvam  Manager (Marketing)
Emirates Transformer & Switchgear Limited
Jebel Ali  Dubai  United Arab Emirates
I acknowledge the hard efforts of sharing thoughts among all educators, scientists of Mr. Jignesh Parmar, see my thoughts for all educators: We all remain as students in our short life on this world?
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thanks for the knowledge shared to us and it is very useful refference on how to calculate or computation for the street light proper engineering works
It seems so informative for the engineers especially electrical engineers for their practical knowledge improvement and of course for the timely help for urgent reference..
very useful information. but i will like to ask, what if u were not given the illuminance, but u were given the intensity, area served and efficacy, how do u find the power, based on an operation of 12hrs per day?
It is Really helped me in real time calculation.
Thank you so much for your sharing.
Very helpful
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DEAR SIR,
HOW TO CALCULATE THE UTILIZATION FACTOR AND MAINTENANCE FACTOR FOR ILLUMINATION CALCULATION
My road width is 5Mts,Distance between poles 20Mts,height o pole is 8mts
What LED i can use for this application
Any post regarding LED selectio.Will be helpful
can anybody please guide me regarding how much wattage of LED will be suficient for a 16 metre height highmast?
Dear Sir ,
when you have calculated the spacing between each pole in that case why you use same factor in two time : Lamp Lumen Depreciation Factor (LLD) is 0.8, Lamp Lumen Depreciation Factor (LLD) is 0.9 .
I think another one will be – Light Loss Factor
Thanks
Regards
Shiv Kumar
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