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.
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