16
The Lighting Handbook
The luminance limit curve method assesses
the mean luminance luminaire from a
viewing angle 45° 85°.
The new European standard sets UGR 19
as the maximum permissible value for
offices, which equivalent the luminance
limiting curve for 500 Quality class 1.
Quality characteristics lighting
A
a
hs
8
6
4
3
2
1
8 10
3
10
4
2 4
5 3
Luminance cd/m2
Quality class
A
1
2
3
1000
2000
750
1500
500
1000 750
<300
500 <300
2000 1000 500 <300
2000 1000 500 <300
for nominal illuminance (lx)
UGRL
13 28
= 45°
= 85°
85°
75°
65°
55°
45°
.
The limit value method was used the
former standard DIN 5035 assess the glare
