03 m
– Cylindrical illuminance 1.19
The Lighting Handbook
The Mean illuminance the arithmetic
brilliance level measured with luxmeter
in defined grid, under precisely specified
conditions.
The following recommendations apply for the
height the measuring levels:
–
Workplaces 0.
Measuring illuminance
Measuring instruments:
Description and precision
– maximum precision, tolerance 3%
– high precision, tolerance 5%
–
B: average precision; tolerance 10%
(minimum requirement)
Measuring conditions
–
Avoid external light/daylight
(measure separately and subtract)
–
Check mains voltage and ambient
temperature
–
Use new, burnt-in lamps (discharge
lamps 100 h)
Measuring grid and measuring level
In order facilitate inspection the light‑
ing system, the measuring grid has been
specified the 12464 (Lighting work-
places) and 12193 (Lighting sports
facilities) standards.03 m
–
Circulation areas, stairs,
car parks (floor) 0.2 m
– Measuring grid: congruent triangles
–
Measuring grid not congruent with
luminaire layout grid
Size measuring field Grid element spacing
1 0.6 m
10 m
50 m
100.2 m
5 0.75 m;
sports facilities (floor) 0
