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

• 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 ### 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 ### 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) 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. ### 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. ### 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 ## 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. ### (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. ### (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.