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UGR – what is it and why is it worth remembering when choosing lighting?
UGR is an abbreviation that is increasingly appearing in descriptions of LED fixtures and lighting projects. But what is UGR and why is its value important for your eyesight, work comfort, and light quality? Find out how to interpret this parameter and how to choose glare-free lighting.
What is UGR and what does this parameter mean?
UGR (Unified Glare Rating) is an indicator that evaluates the level of direct glare caused by lighting fixtures. It determines to what extent the light dazzles the observer.
The UGR scale ranges from 10 to 30:
- UGR 10–16 – no or very little glare,
- UGR 17–19 – a level considered comfortable in residential and office spaces,
- UGR 20–22 – light may already be perceived as tiring,
- UGR > 25 – strong glare, not recommended in commercial spaces.
The lower the UGR, the greater the eye comfort.
Why is UGR important in lighting design?
Excessive light intensity or improper positioning of fixtures can lead to so-called glare, which:
- strains the eyes,
- impairs concentration,
- causes headaches,
- reduces work efficiency.
This is particularly important in places where we spend a lot of time: offices, kitchens, schools, offices, or studios. Lighting comfort directly translates into our well-being and productivity.
What UGR level is appropriate?
| Space Type | Recommended UGR |
|---|---|
| Precision work (laboratories) | ≤ 16 |
| Offices, computer workstations | ≤ 19 |
| Schools, libraries, receptions | ≤ 22 |
| Warehouses, bathrooms, corridors | ≤ 25 |
For residential spaces, we don't always need the lowest UGR, but in a home office or reading light, it's worth aiming for UGR ≤ 19.
What affects the UGR level?
UGR does not depend solely on the light source. Key factors include:
- Fixture type and its construction – milky diffusers, anti-glare grids,
- Beam angle and light source position,
- Power and luminous flux,
- Color and texture of the surroundings – bright walls can reflect light,
- Observer's position – e.g., whether we are looking directly at the light source.
How to reduce glare and UGR level in a room?
- Choose fixtures with UGR ≤ 19 labeling – ideal for work and study spaces.
- Use shades and diffusers – milky covers better diffuse light.
- Use LED profiles with deep light source embedding – e.g., aluminum profiles for LED strips that limit direct view of the diodes.
- Plan fixture placement – uniform lighting reduces contrasts and decreases the risk of glare.
Where is it worth paying attention to low UGR?
- Offices and open spaces – increased ergonomics and concentration.
- Home offices – reduced eye strain.
- Schools, lecture halls, and conference rooms – better viewing comfort for many people.
- Bathrooms and kitchens – better light at mirrors and worktops.
Does every LED lighting have a specified UGR rating?
No – only some fixtures have a precisely calculated UGR rating. Information about it is most often found in product datasheets. If UGR is not provided, it is worth asking the manufacturer or opting for trusted brands.
Summary: What is UGR and why is it worth remembering?
UGR is one of the most important parameters affecting lighting comfort. It is worth paying attention to it when choosing lighting for work, study, or relaxation. By selecting LED fixtures with UGR ≤ 19, you gain not only aesthetically pleasing, but above all healthy and eye-friendly light.
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POLAND
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