16-05-2012, 11:12 AM
TYPES OF LIGHTNING SCHEMES
3. TYPES OF LIGHTNING SCHEMES.ppt (Size: 377 KB / Downloads: 84)
Direct lighting
90 – 100% of light output of the lamp towards downward.
Differ from low to high concentration.
Differs depends upon reflector material.
Lamp surface is visible.
Illumination is not uniform.
Semi direct lighting
60% - 90% of the light output of the lamp downwards.
Some light output illuminate to the celling and upper walls.
Utilization of lamp output can be equal.
Indirect lighting
Output of the lamp is directed upward to the ceiling and upper side of walls.
Reflected back to the working plane area.
Entire ceiling becomes primary source of illumination.
Uniform and glare free.
Lighting is highly expensive and has zero eye strain.
Ideal lighting system for computer Centre and software industry.
Semi - Indirect lighting
Light output of the lamp partially (10 – 30%) downward, but major portion of light output(70 – 90%) upward.
Similar to the indirect lighting.
Downward component will tent to increase room brightness.
Utilization of lamp output is better than indirect lighting system.