Simple Calculation of Flood Light, Facade Light, Street Light & Signage Light-(Part2)

(B) Facade Lighting:

  • Normally Facade Lighting are used to illuminate Building area from Outer Side. 
  • There are three factor should be consider while designing of outdoor Facade Lighting.
  1. Setback
  2. Spacing
  3. Aiming

1) Setback:

  • The recommended setback should be 3/4 times the building height. 
  • If a building is 10 Meter tall, the recommended setback is 7.5 Meter from the building. 
  • If the locating the floodlight closer to the building will sacrifice uniformity and If setting it further back will result in loss of efficiency.
  • Setback distance = 3/4 x Building height
  • Setback distance =3/4 x (10 Meter) = 7.5 Meter 

a

2) Spacing:

  • Spacing of floodlights should not be exceeding two times the setback distance. 
  • If the setback is 7.5 Meter the floodlights should not be placed more than 15 Meter apart.
  • Spacing = 2 x setback distance
  • Spacing=2 x 5  = 15 Meter

b

3) Aiming:

  • The floodlight should be aimed at least 2/3 the height of the building.
  • If a building is 10 Meter high, the recommended aiming point is approximately 6.6 Meter high. 
  • After installation aiming can be adjusted to produce the best fine appearance. 
  • Aiming Point = 2/3 x Building Height.
  • Aiming Point =2/3 (10 Meter) = 6.6 Meter high

c

(C) Sinage Lighting:

  • Normally Sinage Lighting are used to illuminate Sinage Board either Floor Mounted or Pole Mounted
  • There are three factor should be consider while designing of Sinage Board Lighting.
  1. Setback
  2. Spacing
  3. Aiming

1) Setback:

  • When using floodlights to light a sinage, the setback should be 3/4 the sign height
  • If the sinage height is 18 Meter then the setback distance would be 13.5 Meter. 
  • If the floodlight closer to sinage will sacrifice uniformity while setting it further back will in a loss of efficiency.
  • Setback distance = 3/4 x sinage height
  • Setback distance =3/4 (18 Meter) = 13.5 Meter.

d

2) Spacing:

  • The spacing floodlights should not be exceed two times the setback distance. 
  • If the setback is 13.5 Meter, the floodlights should not be placed more than 27 Meter apart. 
  • Spacing = 2 x setback distance.
  • Spacing = 2 x 5 (Meter) = 27 Meter.

e

3) Aiming:

  • The floodlight should be aimed at least 2/3 up the sign.
  • If a sign is 18 Meter tall, then the floodlight should be aimed approximately 12 Meter high. 
  • Aiming can be adjusted to produce the best appearance. 
  • Mounting a full or upper visor to the floodlight can reduce unwanted glare. 
  • Aiming point = 2/3 x sign height
  • Aiming point =2/3 (18 Meter) = 12 Meter high

f

Street Light Pole Height & Spacing (as per CPWD):

  • There are four type of Street Light Pole arrangement.
  • One side Type.
  • Staggered Type.
  • Opposite Type.
  • Central Type.
  • As per CPWD we can calculate Pole Height and Spacing as per under

(1) One side Street Light Pole arrangement.

  • Pole Height = Width of Road.
  • Pole Spacing = 3 to 4 Times Height of Pole.
  • If the Road width is 8 Meter than
  • Pole Height=8 Meter
  • Pole Spacing =24 to 32 Meter.

g

(2) Staggered Type Street Light Pole arrangement.

  • Pole Height = 0.8 time Width of Road.
  • Pole Spacing = 3 to 4 Times Height of Pole.
  • If the Road width is 8 Meter than
  • Pole Height=6.4 Meter
  • Pole Spacing =24 to 32 Meter.

h

(3) Opposite side Street Light Pole arrangement.

  • Pole Height = 0.5 time Width of Road.
  • Pole Spacing = 3 to 4 Times Height of Pole.
  • If the Road width is 8 Meter than
  • Pole Height=6.4 Meter
  • Pole Spacing =24 to 32 Meter.

(4) Central Street Light Pole arrangement.

  • Pole Height = 0.8 time Width of Road.
  • Pole Spacing = 3 to 4 Times Height of Pole.
  • If the Road width is 8 Meter than
  • Pole Height=4 Meter
  • Pole Spacing =24 to 32 Meter.

About Jignesh.Parmar
Jignesh Parmar has completed M.Tech (Power System Control), B.E(Electrical). He is member of Institution of Engineers (MIE) and CEng,India. Membership No:M-1473586.He has more than 16 years experience in Transmission -Distribution-Electrical Energy theft detection-Electrical Maintenance-Electrical Projects (Planning-Designing-Technical Review-coordination -Execution). He is Presently associate with one of the leading business group as a Deputy Manager at Ahmedabad,India. He has published numbers of Technical Articles in “Electrical Mirror”, “Electrical India”, “Lighting India”,”Smart Energy”, “Industrial Electrix”(Australian Power Publications) Magazines. He is Freelancer Programmer of Advance Excel and design useful Excel base Electrical Programs as per IS, NEC, IEC,IEEE codes. He is Technical Blogger and Familiar with English, Hindi, Gujarati, French languages. He wants to Share his experience & Knowledge and help technical enthusiasts to find suitable solutions and updating themselves on various Engineering Topics.

6 Responses to Simple Calculation of Flood Light, Facade Light, Street Light & Signage Light-(Part2)

  1. Davis.E.P. says:

    I want to know High Mast installation regarding

  2. Arun raj says:

    Thank you ,,, chef

    On 02-Nov-2017 8:47 pm, “Electrical Notes & Articles” wrote:

    > Jignesh.Parmar posted: “(B) Facade Lighting: Normally Facade Lighting are > used to illuminate Building area from Outer Side. There are three factor > should be consider while designing of outdoor Facade Lighting. Setback > Spacing Aiming 1) Setback: The recommended setbac” >

  3. fakhri almayahai says:

    Thanks a lots

  4. Ibn Mubarak Adinan says:

    Thank you very much guys

  5. aftab says:

    Sir if building height is 141 meter what should be set back distance?

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