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Calculates values for estimating the glare risk of luminaires outdoors and indoors.

Glare indoors

Input Result
Background luminance LB= cd/m2
Fixture 1
Luminance L1= cd/m2
spatial angle ω1= sr
Guths position index p1= sr
Fixture 2
Luminance L2= cd/m2
spatial angle ω2= sr
Guths position index p2= sr
Fixture 3
Luminance L3= cd/m2
spatial angle ω3= sr
Guths position index p3= sr
Fixture 4
Luminance L4= cd/m2
spatial angle ω4= sr
Guths position index p4= sr
Fixture 5
Luminance L5= cd/m2
spatial angle ω5= sr
Guths position index p5= sr
Unified Glare Rating UGR=

Glare outdoors

Input Result
Glare outdoors Lve= cd/m2
Luminance Lvl= cd/m2
Glare rating RG=

Disturbing glare

Input Result
Source illumination EL= lux
Adjacent illuminance ES= lux
Ambient illuminance EA= lux
Luminance LL= cd/m2
Glare index 1 DBDB=
Glare index 2 DBB=


Unified Glare Rating

Unified Glare Rating or UGR is a number that values glare with the selected location of the current fixtures, which can then be compared in tables for the current business.


Refers to the light from the luminous parts of the luminaire which is directed at the viewer's eye.

Background luminance

Is backround bright in the current case.

spatial angle

Is the angle at which the light of the fixture reaches the viewer's eye measured in steradians.

Guths positionsindex

A value for the location of the luminaire in relation to the deviation from the viewing angle.

Glare Rating

Is a number that values glare with the selected location of the current luminaires.


Refers to the light that hits the current surface from the current source.

Glare index 1

Glare adapted to the De Boer scale (1967).

Glare index 2

Dazzle with a later adjustment according to Bullough (2011) adapted to the De Boer scale.

De Boer scale

1 Unbearable
3 Störande
5 Disturbing
7 Satisfactory
9 Just notable


Glare indoors: Glare indoors
Glare outdoors: Glare outdoors
Disturbing glare: Disturbing glare
Glare index 1: Glare index 1
Glare index 2: Glare index 2