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Maintenance Factor

Condition Factor
Very clean 0.9
Clean 0.8
Average 0.7
Dirty 0.6

Utilization Factor

U.F Factor
U.F               0.6

N = (E x A) / (F x UF x MF)

N = Number of Fittings   F = Total Flux (Lumens) from all the Lamps in one Fitting   E = Lux Level Required on Working Plane  MF = Maintenance Factor  A = Area of Room (L x W)  UF = Utilisation Factor from the Table for the Fitting to be Used

CIBSE Lux Levels

Recommended Lux level for :

Fixture Lumen: