Q: What is Nine Point Glare Assessment Scale?

When glare ratings were first experimentally developed by CIE researchers, the glare control mark GF was related to the glare rating scale as shown in the figure below. As the GF mark value increases, the better glare limitation provided by the installation. The glare rating scale provides meaningful visual information about the differences in glare ratings. The glare rating GR is related to GF as below, so high GF value means better glare control made by the lighting installation. Glare Control Mark GF Glare Rating GR 1Unbearable902 803Disturbing704 605Just Admissible506 407Noticeable308 209Unnoticeable10

Q: What are recommended glare rating limits of area lighting applications / sports lighting applications?

To ensure that glare is not excessive in any normal viewing direction at any normally accessible point on the illuminated area, the maximum value of GR should always be less than the recommended value of GRmax. In the EN12464-2 standard, there are requirements for the GR values of different outdoor lighting places. Take outdoor warehouses as an example. The GR value requirement for temporary loading and unloading areas of large units, raw materials, and solid bulk cargoes is <55. The continuous handling of large equipment and raw materials, loading and unloading of goods, lifting and positioning of cranes, and open loading platforms require a value of <50. Reading, demanding electrical, machine and pipeline installation, and inspection areas require a value of <45.

Question 1

What do the numbers mean in UGR?

Accepted Answer

The size of the UGR value is directly related to the degree of uncomfortable glare, and the value range is 10-30, and the smaller the value, the better. When the UGR value is 10, there is generally no glare. When the UGR value is 16, glare can be perceived, and when the UGR value is ≤19, the glare is considered acceptable. Of course, when the UGR exceeds 19, the user will feel uncomfortable. When the UGR value is 28, there will be a strong sense of discomfort. Although these numbers are an indication, it is important to remember that the interpretation of glare is subjective because everyone's perception is different.

Question 2

UGR 19 high bay light?

Accepted Answer

The statement of UGR 19 high bay light is actually incorrect. Through the study of the text, we know that UGR is related to the lamp, the installation position of the lamp, the installation height, and the position of the lamp and the observer. When "UGR 19 high bay light" is mentioned, it usually means that the UGR value of the high bay light is less than or equal to 19 in actual application to meet the comfort requirements of the lighting venue. Because the value of UGR19 is considered to be a relatively comfortable limit value in the eyes of lighting designers, when UGR<19, it can effectively reduce the impact of glare on the human eye.

Question 3

What is Nine Point Glare Assessment Scale?

Accepted Answer

When glare ratings were first experimentally developed by CIE researchers, the glare control mark GF was related to the glare rating scale as shown in the figure below. As the GF mark value increases, the better glare limitation provided by the installation. The glare rating scale provides meaningful visual information about the differences in glare ratings. The glare rating GR is related to GF as below, so high GF value means better glare control made by the lighting installation.

Glare Control Mark GF Glare Rating GR1Unbearable902 803Disturbing704 605Just Admissible506 407Noticeable308 209Unnoticeable10

Question 4

What are recommended glare rating limits of area lighting applications / sports lighting applications?

Accepted Answer

To ensure that glare is not excessive in any normal viewing direction at any normally accessible point on the illuminated area, the maximum value of GR should always be less than the recommended value of GRmax.

In the EN12464-2 standard, there are requirements for the GR values of different outdoor lighting places. Take outdoor warehouses as an example.

The GR value requirement for temporary loading and unloading areas of large units, raw materials, and solid bulk cargoes is <55.

The continuous handling of large equipment and raw materials, loading and unloading of goods, lifting and positioning of cranes, and open loading platforms require a value of <50.

Reading, demanding electrical, machine and pipeline installation, and inspection areas require a value of <45.

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