presentation on lighting design by tooba imlak
TRANSCRIPT
8/13/2019 Presentation on Lighting Design by Tooba Imlak
http://slidepdf.com/reader/full/presentation-on-lighting-design-by-tooba-imlak 1/23
Presented by:
Tooba Imlak
8/13/2019 Presentation on Lighting Design by Tooba Imlak
http://slidepdf.com/reader/full/presentation-on-lighting-design-by-tooba-imlak 2/23
Why Is Lighting Important
Basic Lighting Terms
Lighting Design Considerations
Different Methods Of Calculation
2
8/13/2019 Presentation on Lighting Design by Tooba Imlak
http://slidepdf.com/reader/full/presentation-on-lighting-design-by-tooba-imlak 3/23
Light plays an essential role in our ability to perceive the world
around us; the lighting system plays a critical role in how we
perceive a space and can even influence how we act in that space.
Lighting can affect performance, mood, morale, safety, securityand decisions.
3
8/13/2019 Presentation on Lighting Design by Tooba Imlak
http://slidepdf.com/reader/full/presentation-on-lighting-design-by-tooba-imlak 4/23
LIGHT
LUMINOUS FLUX
LUMINOUS INTENSITY
ILLUMINANCE
LUMINANCE
4
8/13/2019 Presentation on Lighting Design by Tooba Imlak
http://slidepdf.com/reader/full/presentation-on-lighting-design-by-tooba-imlak 5/23
The part of the electromagnetic spectrum that can be perceived
by the eye.
Region of visible light extends from 380 to 760 nanometers
5
8/13/2019 Presentation on Lighting Design by Tooba Imlak
http://slidepdf.com/reader/full/presentation-on-lighting-design-by-tooba-imlak 6/23
Quantity of light emitted by a lightsource.
Unit is in lumen, LM.
Quantity of light radiated to
particular direction, radiated per
unit angle (Steradian)
Unit of luminous intensity is onelumen per Steradian (Candela)
6
8/13/2019 Presentation on Lighting Design by Tooba Imlak
http://slidepdf.com/reader/full/presentation-on-lighting-design-by-tooba-imlak 7/23
Quantity of luminous flux fallingon a unit area of surface.
E=F/A , unit is lux
Luminance or Brightness is aluminous intensity of a surfacein a given direction per unit ofprojected area of the surface.
Unit of luminance is cd /m² orlumen/ m².
7
8/13/2019 Presentation on Lighting Design by Tooba Imlak
http://slidepdf.com/reader/full/presentation-on-lighting-design-by-tooba-imlak 8/23
8/13/2019 Presentation on Lighting Design by Tooba Imlak
http://slidepdf.com/reader/full/presentation-on-lighting-design-by-tooba-imlak 9/23
Acceptable minimum standards of light levels are set by the
I l luminating Engineers Society (IES).
For Example:
• Corridors, Passage ways: 100 Lux
• Stairs, Lifts: 150 Lux
• Kitchen: 500 Lux
• Restaurants: 300 Lux
• Parking Areas: 30 Lux• General Offices: 500 Lux
• Theatre & Concert halls: 100 Lux
9
8/13/2019 Presentation on Lighting Design by Tooba Imlak
http://slidepdf.com/reader/full/presentation-on-lighting-design-by-tooba-imlak 10/23
One of the most important considerations in selecting a light source
is how much light it will generate.
Two measurements are needed because, like most devices, lamps
lose some light output over their rated life
I NITIAL LUMENS
Initial lumens is a term defined as the amount of light output
from a lamp when it is new.
MEAN LUMENS
Any light source will decrease in light output the longer it isoperated. To properly light a facility for the useful life of a lamp,
an "average" lumen output is calculated known as mean lumens.
10
8/13/2019 Presentation on Lighting Design by Tooba Imlak
http://slidepdf.com/reader/full/presentation-on-lighting-design-by-tooba-imlak 11/23
The efficacy of a lamp refers to the number of lumens leaving the
lamp compared to the number of watts required by the lamp (and
ballast).
It is expressed in lumens per watt.
The H igher The Lumen Per Watt Rating Of A Lamp The Better -
- M eaning Greater L ight Output For A F ixed Wattage I nput.
11
8/13/2019 Presentation on Lighting Design by Tooba Imlak
http://slidepdf.com/reader/full/presentation-on-lighting-design-by-tooba-imlak 12/23
It measures the degree that perceived colors of objects,
illuminated by a given light source, conform to the colors of
those same objects when they are lighted by a reference
standard light source.
12
8/13/2019 Presentation on Lighting Design by Tooba Imlak
http://slidepdf.com/reader/full/presentation-on-lighting-design-by-tooba-imlak 13/23
The higher the color rendering index, the less color shift or distortion
occurs.
13
8/13/2019 Presentation on Lighting Design by Tooba Imlak
http://slidepdf.com/reader/full/presentation-on-lighting-design-by-tooba-imlak 14/23
This is a measurement of "warmth"
or "coolness" provided by the lamp,
expressed in Kelvins .
People usually prefer a warmer sourcein lower illuminance areas, such as
dining areas and living rooms, and
a cooler source in higher illuminance
areas, such as grocery stores.A "Warm" color light source actually
has a lower color temp.
14
8/13/2019 Presentation on Lighting Design by Tooba Imlak
http://slidepdf.com/reader/full/presentation-on-lighting-design-by-tooba-imlak 15/23
Incandescent
High-pressure Sodium
Compact Fluorescent
Full-size Fluorescent
Mercury Vapor
Metal Halide
LED
15
8/13/2019 Presentation on Lighting Design by Tooba Imlak
http://slidepdf.com/reader/full/presentation-on-lighting-design-by-tooba-imlak 16/23
There are important factors with respect to lighting quality .
Some of them are discussed here:
• Glare,
•
Uniformity of Illuminance• Color Rendition ( as discussed above)
16
8/13/2019 Presentation on Lighting Design by Tooba Imlak
http://slidepdf.com/reader/full/presentation-on-lighting-design-by-tooba-imlak 17/23
Glare is a sensation caused by luminance in the visual field that
are too bright. Discomfort, annoyance, or reduced productivity can result.
Glare can be reduced by not exceeding suggested light levels and
by using lighting equipment designed to reduce glare. For eg lens
or louver.
proper fixture placement can reduce reflected glare on worksurfaces or computer screens
17
8/13/2019 Presentation on Lighting Design by Tooba Imlak
http://slidepdf.com/reader/full/presentation-on-lighting-design-by-tooba-imlak 18/23
The uniformity of illuminance is a quality issue that addresses
how evenly light spreads over a task area.
• Inadequate light levels in some areas
• Visual discomfort when tasks require frequent shifting of view from
under lit to over lit areas
• Bright spots and patches of light on floors and walls that cause
distraction and generate A low quality appearance
18
8/13/2019 Presentation on Lighting Design by Tooba Imlak
http://slidepdf.com/reader/full/presentation-on-lighting-design-by-tooba-imlak 19/23
8/13/2019 Presentation on Lighting Design by Tooba Imlak
http://slidepdf.com/reader/full/presentation-on-lighting-design-by-tooba-imlak 20/23
Calculation by Lumen Method :
The average illuminance produced by a lighting installation or the
number of luminaries required to achieve a specific averageilluminance, can be calculated by means of utilization factors. The
average illuminance E, over a reference surface s can be
calculated from the "LUMEN METHOD" formula.
E = ___F x n x N x MF x UF.___
Area of Surface (S)
20
8/13/2019 Presentation on Lighting Design by Tooba Imlak
http://slidepdf.com/reader/full/presentation-on-lighting-design-by-tooba-imlak 21/23
E = ___F x n x N x MF x UF.___
Area of Surface (S)
where:
• F is the initial bare lamp flux (lumens)
• n is the number of lamps per luminaire
• N is the number of luminaires
• Uf , is the utilization factor for the reference surface (s)
• MF is the maintenance factor (Dirty: 0.7 , Normal: 0.8 , Clean:0.9)
21
8/13/2019 Presentation on Lighting Design by Tooba Imlak
http://slidepdf.com/reader/full/presentation-on-lighting-design-by-tooba-imlak 22/23
A Software Project Launched By Dial GmbH
It Started In 1994 In Dial, Ludenscheid, Germany
Lighting Design Tool Which Is Continually Updated And Adapted To
The Requirements Of The Planners
22
8/13/2019 Presentation on Lighting Design by Tooba Imlak
http://slidepdf.com/reader/full/presentation-on-lighting-design-by-tooba-imlak 23/23
23