Lumen design method for buildings

1. Procedure for Lumen Lighting Design Method
Step 1: Find required Lux level (It can be given)
Step 2: Select Luminaire type (It might be given)
Step 3: Determination of Room Index and Utilization factor if not given.
Step 4: Determination of Number of Luminaires
N =
E ×A
F ×U.F ×M.F
Step 5: Determination of minimum spacing between luminaires
SHR is the ratio of distance between 2 luminaires to their height above working
plane, Hm
Min. Spacing between Luminaires = SHR × Hm
Step 6: Determination of No. of required rows of luminaires along width of the room
No. of rows required = Width of Room Min.Spacing between luminaires
⁄
Step 7: Determination of Number of luminaires in each row
No. of luminaires =
Total Fixtures
Number of rows
Step 8: Determination of Axial spacing between each Luminaire
Axial Spacing =
Length of Room
No. of luminaires in each row
Step 9: Determination of Transverse spacing between Luminaires
Transverse Spacing =
Width of room
No. of Luminaires in each row
For the purpose of aesthetic and balanced arrangement adopt the right/even number of
luminaires.
Sketch of the arrangement of luminaires with the right dimensions.