Lighting Calculations Excel sheet : Free excel sheet for illumination and lighting Calculations for building This spreadsheet calculates the required illumination for eatch room in a building.
 |
| Lighting Calculations Excel sheet |
Lighting calculations Excel sheet
Factors affected on illuminance calculations:
1-Room Reflectance
The room is consldered to consist of three main surfaces:
- The ceiling caity.
- The walls,and
- The floor cavity ( or the horizontal working plane ).
The effective reflectances of the above three surfaces affect the quantity of reflected light received by the working plane.
2-Luminaire maintenance factor (LMF)
Is the proportion of the initial light output from a luminaire after a set time to the initial light output from a lamp after a set time .
Three factors must be considered in its determination:
- the type of luminaire
- atmospheric conditions, and
- maintenance interval.
3- Room surface maintenance factor ( RSMF )
is the proportion of the illuminance provided by a lighting installation in a room after a set time compared with that occurred when the room was clean
4- Utilization factor ( UF )
Is the proportion of the luminous flux emitted by the lamps which reaches the working plane.
Factors that affect the value of UF are as follows:
- Light output ratio of Luminaire
- Flux distribution of Luminaire
- Room proportions
- Room Rflectance
- Spacing/Mounting height ratio
