EN 12464-1 refer to CIE’s tabulated UGR method when you need to carry out an evaluation of discomforting glare in an indoor lighting installation. The tabulated UGR method is based on the formula. To establish the glare rating in a lighting calculation the following is required:
If the aforementioned requirements are not met you can use a product’s UGR table to see the glare rating. As luminaire manufacturers, we provide datasheets or tabular data*, so that you can quickly and easily establish the average glare rating per room.
* The UGR tables for each respective product (those with symmetrical light distribution) are incorporated in the light data file and can be seen in the calculation program or calculation results.
Figure 1 Example of differences in contrast between dark and light backgrounds.
|Ref. no.||UGRL||Examples of area, task or activity|
|5.26.3||UGR16||Office: Technical drawing work|
Office: Writing, typing, reading, data processing
|5.2.1 5.27.1||UGR22||Common spaces in buildings: Cafeterias, serving rooms
Retail trade: Sales area
|5.2.4||UGR25||Common spaces in buildings: Cloakrooms, washrooms, bathrooms, toilets|
|5.1.1||UGR28||Communication areas: Communication areas and corridors|
A room has certain conditions that can’t always be influenced but nonetheless have an effect on UGR value.
(See the standard values for reflectances on ceiling/wall/floor in the Light Template Indoors p. 8)
You can affect the UGR value with the choice of luminaire and lighting.