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HomeIndustriinformationUGR- we need to know

UGR- we need to know

2018-11-20

With the rise of the lighting industry and the improvement of people's living standards, lamps are no longer a simple lighting tool. Today's lamps can be used in all walks of life and play various roles, such as medical lamps. Decorative lamps, industrial lamps, etc. 

Of course, while the lamp is widely used, many problems about the lamp are also beginning to appear, such as heat dissipation, waterproofing, and protection; light effect illumination, light angle, brightness, UGR, and the like. 

Today we are talking about UGR. 

What is UGR? I believe this is no stranger to industry veterans. Especially at the stage of fighting UGR, many engineers have sacrificed beautiful long hair for this. Although many people are no strangers to this, it is still necessary for newcomers in the industry to understand. 

UGR is the number from 10 to 30,bigger numbers mean more people are uncomfortable,such as UGR=19,means 65% people dont feel the glare,35% people feel uncomfortable.

Disability glare is a glare that reduces visual effects and visibility, and it is often accompanied by discomfort. It is mainly caused by the stray light of the high-intensity light source entering the eye in the field of view, scattering in the eyeball and causing the image clarity and contrast on the retina to decrease. Disability glare is measured by the ratio of the visibility of a job under a given lighting facility to its visibility under reference lighting conditions, called the disability glare factor (DGF). 

Diseomfort glare, also known as "psychological glare," refers to glare that causes visual discomfort but does not cause a decrease in visibility. 

The above two types of glare are the so-called UGR (Unified Glare Rating), which is one of the main contents of lighting quality evaluation in lighting design. These two kinds of glare can appear at the same time, or they can appear in a single way. The same UGR is not only a visual problem, but also a design and application problem. Now, let’s talk about how to reduce UGR as much as possible in actual operation. Comfortable value. 

1, the first is the design 

It is believed that people who come into contact with lamps know that general lamps are composed of a casing, a power source, a light source, a lens or glass. At the beginning of the design, there are many ways to control the UGR value, such as controlling the brightness of the light source, or making it on the lens and glass. Anti-glare design, as shown below:

2, or design problems 

Within the industry, when the general luminaire meets the following conditions, it is unanimous that there is no UGR: 

1VCP (visual comfort probability) ≥70; 
2 When looking indoors in the vertical or horizontal direction, the ratio of the maximum luminaire brightness (the brightest 6.5cm2) to the average luminaire brightness at the angles of 45°, 55°, 65°, 75° and 85° with the vertical line ≤ 5:1; 
3 To avoid uncomfortable glare The maximum brightness at each angle of the luminaire and the vertical line should not exceed the following table when viewed vertically or horizontally:

3. Method of controlling UGR in the later stage 

1 Avoid installing the luminaire in the interference zone; 
2 using low gloss surface decoration materials; 
3 limit the brightness of the lamp. 

There are still many ways to control UGR. Interested friends can find information on their own. I think that I am not correct or not comprehensive, welcome everyone to comment and supplement by commenting on the message! 

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