Unified Glare Rating (UGR)
Activity type
LUX
UGRL
Ra
Bakeries
Preparation and baking ovens
300
22
80
Finishing, baking, decoration
500
22
80
Hairdressers’
Hairdressing work
500
19
90
Jewel manufacture
Work with precious stones
1500
16
90
Jewel manufacture
1000
16
90
Manual watchmaking
1500
16
80
Automatic watchmaking
500
19
80
Laundries and dry cleaner’s
Marking, classification of items and washing
300
25
80
Dry cleaning, ironing and steam ironing
300
25
80
Inspection and repairs
750
19
80
Leather and leather items
Working with paints, barrels and pits
200
25
40
Cleaning and rubbed skins
300
25
80
Tanning, shoemaking
500
22
80
Quality control
1000
19
80
Inspection of colours
1000
16
90
Metal work and treatment
Open die forging
200
25
60
Hot stamping, welding
300
25
60
Tool making
750
19
60
Rough assembly
200
25
80
Mean assembly
300
25
80
Fine assembly
500
22
80
Precision assembly
750
19
80
Galvanization
300
25
80
Preparation of surfaces and painting
750
25
80
Tool making, micromechanics
1000
19
80
Paper and paper items
Vertical mill and pulp
200
25
80
Paper processing and manufacturing
300
25
80
Standard binding, folding, gluing
500
22
80
Electrical energy plants
Boiler casing
100
28
40
Machine rooms
200
25
80
Presses
Cutting, engraving, typography, printing blocks, printing
500
19
80
Classification of paper and hand printing
500
19
80
Rate adjustments, retouches, lithography
1000
19
80
Inspection of colour printing, multicolour
1500
16
90
Recorded in steel and copper
2000
16
80
Rolling, steel plants
Product installation without manual intervention
50
-
20
Product installation with continuous manual intervention
200
25
80
L= The luminance value of the luminaire
Lb= The value of the background luminance
ω= The solid angle of the luminaire that is seen by the viewer
p= The Guth Index. Based on the likelihood of glare, also known as Visual Comfort Probability Σ= Shows that the equation (shown above) includes all the fittings located within the area.
There are two methods to reduce the glare seen when it comes to interior lighting. Firstly, to use luminaires that are UGR<19 rated; secondly to ensure that the lighting design is appropriate for the environment they are being used in i.e. the correct number and position of luminaires.
Within an office setting, for the luminaire to be classified as “low glare” it must have a UGR below 19 at desk level. Any glare level above this rating may otherwise cause discomfort to office workers – this further enforces the need for high quality interior lighting that is rated UGR<19.
There are a number of different UGR limits that should not be exceeded in certain environments, these include:
(UGR Rating / Environment)
UGR ≤ 16 Technical drawing
UGR ≤ 19 Reading, writing, training, meetings, computer-based work
UGR ≤ 22 Craft and light industries
UGR ≤ 25 Heavy industry
UGR ≤ 28 Railway Platforms, Reception Areas
The UGR of the Blindspot is 16. To view catalogue click here