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6. Simple Calculation of Flood Light, Facade Light, Street Light & Signage Light-(Part-2)

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

  1. 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

  1. 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

  1. 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

  1. 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.