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UGR calculation
Reflection factors:
Ceiling compartment
0.7
0.7
0.5
0.5
0.3
0.7
0.7
0.5
0.5
0.3
Walls
0.5
0.3
0.5
0.3
0.3
0.5
0.3
0.5
0.3
0.3
Working surface
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
Location measurements
Fitting seen
Fitting seen
x
y
transversally
longitudinally
2H
15.1
16.1
15.4
16.4
16.6
17.6
15.6
14.9
15.8
16.1
3H
15.6
16.5
15.9
16.8
17.1
15.1
16.0
15.4
16.3
16.6
2H
4H
15.9
16.7
16.2
17.0
17.3
15.4
16.2
15.7
16.5
16.8
6H
16.2
17.0
16.5
17.3
17.7
15.7
16.5
16.1
16.8
17.2
8H
16.4
17.1
16.7
17.5
17.8
15.9
16.6
16.2
17.0
17.3
12H
16.5
17.3
16.9
17.6
18.0
16.0
16.8
16.4
17.1
17.5
2H
15.9
16.8
16.2
17.1
17.4
15.3
16.2
15.7
16.5
16.8
3H
16.6
17.3
16.9
17.7
18.0
16.0
16.8
16.4
17.1
17.5
4H
4H
17.1
17.8
17.4
18.1
18.5
16.5
17.2
16.9
17.6
17.9
6H
17.6
18.2
18.0
18.6
19.0
17.1
17.7
17.4
18.1
18.4
8H
17.9
18.5
18.3
18.9
19.3
17.4
18.0
17.8
18.4
18.8
12H
18.3
18.8
18.7
19.2
19.6
17.7
18.3
18.2
18.7
19.1
4H
17.9
18.5
18.3
18.9
19.3
17.4
18.0
17.8
18.4
18.8
8H
6H
18.6
19.2
19.0
19.6
20.0
18.1
18.7
18.5
19.0
19.5
8H
19.2
19.7
19.6
20.1
20.5
18.6
19.1
19.1
19.6
20.0
12H
19.7
20.2
20.2
20.6
21.1
19.2
19.7
19.6
20.1
20.5
4H
18.3
18.8
18.7
19.2
19.6
17.7
18.3
18.2
18.7
19.1
12H
6H
19.2
19.7
19.6
20.1
20.5
18.6
19.1
19.1
19.6
20.0
8H
19.7
20.2
20.2
20.6
21.1
19.2
19.7
19.6
20.1
20.5
UGR Values for determination of direct glare
The "Unified Glare Rating (UGR)" method was developed by the CIE (Commission International de the Eclairage) to have to have a universal standardized system for evaluating glare. This method is based upon on a formula similar to that of the British Glare-Index system. Unlike Sollner's diagrams, which give evaluations to the glare of each single fitting, the UGR formula was studied and developed to judge glare generated by an entire and complete lighting system. With this objective in mind, the formula considers the luminance of every installed fitting and the luminance of the walls or ceiling where they are installed with respect
to positions where an observer would normally stand.
The diagram shows two UGR values
for a standard room.
The first refers to a transversal view
with respect to the fittings and the
second to a longitudinal view.
They are absolute values related to
the rated flow of the lamps installed.
We took a standard location into
consideration.
8 H length and 4 H width.
The spacing of the fittings in both
directions is S=0,25 H.
reflection index: ceiling 70%,
walls 50%, floor 20%.
H=height of the light fitting above
the eye of the observer.
Lux
h
d1
d2
Em
Emax
1
1.6
1.6
764
1103
2
3.2
3.1
191
276
3
4.9
4.7
85
123
4
6.5
6.3
48
69
Imax=1121 cc
90=
CIE
nL0.49_
UGR M.SAT^J
A.SO UTE
0.49A+0.00T
-"1=345
-M1+FM2=996
f,,1+F"2+F"3=999
CIBSE
_G3 L.S500 cd/m! at S5' BZ1
UGR Values for spacing S between fittings
S= 1.0H
2.5 / -7.7
3.0 /-8.8
1.5H
4.9 / -22.1
5.4 / -23.8
2.0H
6.9 / -24.3
7.4 / -25.0
TC-D-G24d3 tx-78°/76°
Example of calculation available on request
Photometric classification
DIN 5040
According to this standard, the photometric classification of light fittings is composed of one letter and two numbers (A60, for example). The letter (A,B,C,D,and E) identifies the percentage of light flux emitted in the lower and upper hemispheres. The closer to letter A, the higher the percentage of flux emitted in the lower hemisphere. The numbers that follow identify, respectively, the flux toward the work surface and the flux toward the ceiling in a typical standard configuration.
UTE C71-121
The photometric classification
of the light fittings is composed
of the output in the lower hemisphere
followed by a letter, plus the output
in the upper hemisphere followed
by another letter (for example:
0,50D+0,24T).
The letters range from A to J and they represent the percentage of light flux within set solid angles, while the presence of letter T indicates that part of the light flux is emitted into the upper hemisphere.
CIBSE
The photometric classification of the light fittings is divided into
ten categories (BZ1.....BZ10).
The category indicates the percentage
of light flux emitted into the lower hemisphere which directly reaches the work surface in a typical configuration. For this reason the classification is also related to the location index. For instance, the fittings classified as BZ1 emit higher quantities of light flux onto the work surface than fittings identified BZ2 -10
12
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