.
The reflectance factor table the system
helps you determine the reflectance factors.13
The Lighting Handbook
Maintenance value maintenance factor initial value
Relative illuminance (%)
Operating time
(years)
– Initial value
– Maintained
illuminance with
3-year cleaning
–
System value with-
out maintenance
150
1 5
125
100
75
50
25
0
Reflectance factors
The reflectance factors the room and
object surfaces determine not only the
perception the room but also the reflected
light and thus the room’s brightness
