UGR (Uniform Glare Value) is an indicator proposed by the International Commission on Illumination (CIE) to quantify indoor discomfort glare, and its classification is based on the degree of impact glare has on the human eye. According to multiple criteria and application scenarios in search results, UGR anti glare levels can be divided into the following seven categories:
UGR < 10
Almost glare free: suitable for places with extremely high visual comfort requirements, such as operating rooms, precision laboratories, etc., where glare interference is almost imperceptible to the human eye.
10 ≤ UGR < 13
Slight glare: Suitable for environments that require high visual accuracy, such as drawing rooms, high-end offices, etc., glare has a minimal impact on visual tasks.
13 ≤ UGR < 16
Acceptable glare: Suitable for places that require focused attention, such as regular classrooms, libraries, etc. The UGR limit for ordinary classrooms in national standards is ≤ 19, but local standards or actual designs often require ≤ 16 to improve comfort.
16 ≤ UGR < 19
Moderate glare: suitable for general work environments such as conference rooms or mild industrial areas. Glare within this range may cause slight discomfort, but it is still within the acceptable range . UGR<19 LED Panel light can protect eyes , also widely use now .
19 ≤ UGR < 22
High glare: approaching the threshold of discomfort, commonly found in industrial workshops, warehouses, and other places with high tolerance for glare. Attention should be paid to avoiding prolonged visual tasks.
22 ≤ UGR < 25
Significant glare: may cause obvious discomfort, only suitable for short-term stay areas such as corridors, stairwells, and other non work focus areas .
UGR ≥ 25
Severe glare: beyond the tolerance range of the human body, may cause visual fatigue or headache, not suitable for any place that requires visual work .
Supplementary explanation
Classification basis: CIE recommends using 3 UGR units as one glare level, with each level corresponding to a noticeable change of 615 visible to the human eye.
Actual application differences: Different lighting fixtures with the same UGR value (such as panel lights and grille lights) may have different actual perceptions due to brightness distribution or reflection characteristics. It is necessary to optimize the design based on actual measurements or simulation calculations.
Standards and actual testing: National standards (such as GB 50034-2013) specify UGR limits for different scenarios, and actual testing needs to consider factors such as spatial layout and reflectivity. Generally, the UGR value at the most unfavorable position (such as the back row of the classroom) is used as the standard.
When selecting UGR level, it is necessary to combine specific scene requirements and relevant standards, and ensure glare control meets standards through simulation calculations or actual measurements. you can choose UGR<19 LED Lamp on http://www.benweilight.com
