One of the terms that often appears in the specifications of a lamp or when creating a lighting plan is the UGR glare rating. Because this term is often unfamiliar, this blog explains what UGR is, which factors play a role, and how you can minimize glare with the right lighting.

What does UGR mean?

UGR stands for Unified Glare Rating. It is a value that indicates the extent to which lamps and luminaires cause glare from a particular viewing position. For example, think of car headlights shining directly into your eyes through your mirror—that is a form of glare. Within the lighting industry, standards and guidelines have been established to limit glare and create a comfortable visual environment.

Why is the UGR value important?

The UGR value is often underestimated when designing a lighting plan, especially in work environments. However, glare has a significant impact on productivity and comfort. Incorrect lighting can lead to:

• Eye strain and headaches.

• Reduced concentration and productivity.

• An uncomfortable working environment.

Which UGR values are suitable for different applications?

The recommended maximum UGR value depends on the activities carried out in a space:

• Offices and classrooms: UGR ≤ 19 – for prolonged concentrated work without visual distraction.

• Shops and general work areas: UGR ≤ 22 – a balance between sufficient brightness and a limited risk of glare.

• Industrial work and production areas: UGR ≤ 25 – less strict, but still important for safe working conditions.

• Corridors and passageways: UGR ≤ 28 – glare is less critical here because people spend only a short time in these areas.

Factors that influence the UGR value

UGR is determined not only by the light source itself, but also by:

• Type of luminaire: Matt-finished or shielded luminaires reduce glare.

• Reflection in the space: Smooth and reflective surfaces, such as glass desks or glossy floors, can reflect light and increase the UGR.

• Position of the light: A direct view of a bright light source increases the risk of glare, while indirect lighting reduces it.

How does Qub track lighting help reduce glare?

Qub offers flexible track lighting systems that help lower the UGR through:

• Adjustable track spots: Adjust the direction of the light to minimize glare.

• Diffusers and shields: Reduce direct visibility of the light source for more comfortable lighting.

• Dimmable options: Adjust the light intensity to limit overlighting and differences in contrast.

• Targeted lighting: Create a lighting plan in which task lighting and general lighting are balanced.

Conclusion

The UGR glare rating plays an important role in the comfort and effectiveness of lighting in work and public spaces. By taking the correct UGR value into account and using smart lighting solutions such as Qub track lighting, you can create a pleasant and productive environment. Would you like to know more about how to prevent glare? Contact our Qub lighting experts!