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

ugr.png

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