06-05-2019, 10:35 AM
Design of the lighting system : lumen method
This method gives rough and reasonable estimates of the lamps / luminaires needed. It is used in areas where a uniform light intensity is required for the work area. Illumination level required at the work surface is obtained by,
![[Image: image-32.png]](http://frontdesk.co.in/wp-content/uploads/2019/06/image-32.png)
E = illumination level required at the work surface
A = total area of the plane where the work is done.
Φrec = flux of light received on the working surface.
To estimate the average illuminance of the installation at a particular stage in its life. This is achieved by using the following formula:
![[Image: image-33.png]](http://frontdesk.co.in/wp-content/uploads/2019/06/image-33.png)
Em = Maintained illuminance (lux)
ϕin = Initial luminous flux of the light source (lumen)
n = Number of lamps per luminaire
N = Number of luminaires
A = Area to be illuminated (m2)
UF = Utilization factor for the luminaire in the room
MF = Maintenance factor
To know more about illumination read .... http://frontdesk.co.in/building-science/illumination-in-architecture/
This method gives rough and reasonable estimates of the lamps / luminaires needed. It is used in areas where a uniform light intensity is required for the work area. Illumination level required at the work surface is obtained by,
E = illumination level required at the work surface
A = total area of the plane where the work is done.
Φrec = flux of light received on the working surface.
To estimate the average illuminance of the installation at a particular stage in its life. This is achieved by using the following formula:
Em = Maintained illuminance (lux)
ϕin = Initial luminous flux of the light source (lumen)
n = Number of lamps per luminaire
N = Number of luminaires
A = Area to be illuminated (m2)
UF = Utilization factor for the luminaire in the room
MF = Maintenance factor
To know more about illumination read .... http://frontdesk.co.in/building-science/illumination-in-architecture/