The UGR values for luminaires
are determined using the table method
pursuant CIE 117.
UGR limits (UGRL) that must not be
exceeded:
≤ Technical drawing
≤ 19
Reading, writing, training, meetings,
computer-based work
≤ Craft and light industries
≤ Heavy industry
≤ Railway platforms, foyers
( )
P2
.0 (same glare level 19). The result a
UGR index.15
The Lighting Handbook
UGR log 0,25
Lb
∑
L2Ω
(1) (2)
The UGR method
The standardised UGR method (unified glare
rating) used assess (psychological) glare. Zumtobel quotes both a
UGR reference value for reference room
and the UGR tables for other room sizes for
the majority luminaires its data sheets
and their website.
It explained the standard 12464-2.
The UGR method takes account the
brightness walls and ceilings (1) well as
all luminaires the system that contribute to
the sensation glare (2).
Example: 18.
This takes into account all the luminaires
in the system that contribute the impres-
sion glare.
The UGR limits are specified the
EN 12464 standard for activities and visual
tasks (see tables pages 31–41).
The UGR tables are available for each lumi-
naire via the respective photometric data
sheet: Select product Photometry
Select layout
The values are hereby used for classifica-
tion glare level.5 (level) but not better
than 19.
Note: the glare value used outdoors. comparison indi
vidual values does not allow any statement.
The UGR value calculated with formula
