0.75 m
the measurement grid can be found in DIN EN 12464 and DIN EN 12193.
1.0 m
The measured values are represented in tabular form. A graphical representation of the illuminance in isolux curves is obtained by joining up measurement points of the same illuminance. The uniformity of illuminance UO is the quotient of the lowest measured illuminance Emin and the calculated mean illuminance E.
0.1 m 97
Create measurement log A log should be created for each measurement. This should contain e.g. the measured values but also the ě?? Ambient conditions ě?? Information on light sources, luminaires and the geometry of the lighting system Entering not only the lighting quality characteristics, but also noting all technical data of a system (e.g. operating hours per year, electricity costs, cleaning cycles and maintenance factors) will result in an easy-toupdate overview which can be used as the basis for making economic decisions.
E
L
Illuminance E: Incident light - not visible to human eye (measured with lux meter)
[97] Horizontal illuminance levels are measured in indoor environments (work places) 0.75 m above the ground and 0.1 m above the ground on thoroughfares, streets and parking areas. Vertical illuminance levels at indoor and outdoor sports facilities are measured 1.0 m above the ground. [98] For street lighting system assessment, the luminance L of the road surface/roadway is measured using a luminance meter.
Luminance L: Reected light - visible to human eye (measured using luminance meter) 98
Light meters and their accuracy Class
Quality
Application
A
High
Precision photometry
B
Medium
Operating photometry
C
Low
Rough photometry
55