Introduction:
- Outdoor Lighting can be classified according to the location where it can be installed or its function which use for highlight landscape area.
- Outdoor Lighting can be classified as
- Flood Lighting,
- Facade Lighting and
- Signage Lighting
- Street Light
(A) General Outdoor Flood Lighting:
- Normally Pole mounted floodlights are used to illuminate general lighting area of parking lots and storage yards.
- There are three factor should be consider while designing of outdoor flood lighting.
- Mounting Height.
- Spacing
- Aiming Distance.
- Horizontal Aiming.
1) Mounting Height:
- Mounting height should be one half the distance across the area to be lighted.
- If the area to be lighted is 16 Meter, the lowest recommended mounting height is 8 Meter.
- Mounting height = 1/2 distance to be lighted
- 1/2 (16 Meter.) = 8 Meter.
2) Spacing:
- When more than one Luminar / pole is required than distance between two adjacent luminar / Pole is 4 times Mounting height of luminar /pole.
- If the mounting height of luminar /Pole is 8 Meter than distance between adjacent Luminar is 32 Meter.
- Pole Spacing = 4 x mounting height.
- 4 (8 Meter pole) = 32 Meter between poles
3) Vertical Aiming:
- The fixture should be aimed 2/3 of the distance across the area to be lighted and at least 30 degrees below horizontal.
- If the area to be lighted is 16 Meter across, the recommended aiming point is 10.6 Meter.
- Aiming point = 2/3 Distance to be lighted.
- 2/3 (16 Meter) = 10.6 Meter aiming point
- To minimize glare, the recommended aiming point distance should never exceed twice the mounting height.
- If a pole is 8 Meter high, the vertical aiming point should not exceed 16 Meter.
- 2 (8 Meter mounting height) = 16 Meter.
4) Horizontal Aiming:
- When two floodlights is mounted to a single pole then horizontal aiming also must be considered.
- Each floodlight should be vertically aimed according to the two-thirds rule.
- The floodlights should be aimed up to 90 degrees apart.
October 01, 2017 at 07:29PM
