[Manish Jain]

Study notes for  Illumination (lighting)  useful for students of architecture

Basic Terminology and Definitions
Luminous flux
Luminous  intensity
Illuminance
Luminance
luminaire efficiency
Laws of Illumination
The Inverse Square Law of Illuminance
The Cosine Law of Illuminance / Lambert’s Cosine Law
Laws of Reflection and Refraction
Visual efficiency & comfort
Day lighting
Components of Daylight Factor
Artificial Lighting Design
Identification of Lighting Requirements
Artificial light sources
Design of the lighting system : lumen method
Classification of lighting system
LED light : The Kelvin Scale
Exterior lighting system
Exterior illumination
Roadway Lighting Layouts
Floodlighting
Software for illumination calculation in project

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Information on this site is purely for education purpose. Their use here does not imply that you may use them for any purpose other than similar informational.

[FDArchitects]

Design of the Lighting System

A simple means of designing lighting systems is achieved by means of the lumen method; this is a simplified design approach to enable the designer to achieve an even light distribution in spaces of reasonably simple geometry (i.e. rectangular).

The basis of the lumen method is the following equation:

          E X A
N= ------------------
     n x F x MF X UF


N - is the number of luminaires required;
E - is the required illuminance (lux);
A - is the area to be lit;
N - is the number of lamps per luminaire;
F - is the lamp lumen output (lumens);
MF - is known as the maintenance factor, which is a combination of three factors;
UF - is the utilisation and is a function of the luminaire properties and room geometry.


Utilisation Factor (UF)
The room geometry is a crucial factor in determining the utilisation factor term in the lumen equation. Several parameters are important.

In the Lumen method of design the room geometry is characterised by a room index (K):

        L X W
K = -----------
       (L+W)hm

L= length of room 
W= width of room 
hm = height of room ( distance between working plane and ceiling plane ) 


The calculation of surface reflectances is more complicated for imaginary planes such as the luminaire and working planes, in these cases the reflectances of these planes must be calculated as an equivalent cavity reflectance (ρe):



Utilization factors 

[dipak.jain]

Thanks for sharing very useful information on architectural illumination.

[harshita]

To know more about illumination read .... http://frontdesk.co.in/building-science/illumination-in-architecture/