What Does UGR Glare Factor Stand For?

One of the terms often found in the specifications of a lamp or when creating a lighting plan is the UGRglare factor. Since this is often a relatively unknown term, we will explain more about UGR in this blog, what factors play a role, and what to look for when you want to minimize light discomfort.

What Does UGR Glare Factor Stand For?

UGR stands for UnifiedGlareRating. This is a value that indicates the extent to which lamps and fixtures cause light discomfort or glare from a specific position. Think of car headlights shining directly in your eyes through the rearview mirror: this is also a form of glare. For indoor lighting, there are standards and guidelines that lamps and fixtures must meet in order to cause no or minimal glare.

Why is the UGR Value Important?

The UGR value is something that is often underestimated when creating a lighting plan for businesses, but it is still an important factor. Glare can affect how you perform. When you are irritated by the light, you naturally work less comfortably than when you feel at ease. In addition to good visibility, the UGR value is an important factor to consider.

The recommended maximum UGR value depends on the activities being carried out in a room. For example, in office work, the UGR should not exceed 19, and in industrial work, it should not exceed 25. In hallways and passageways, the maximum UGR is 28, as people generally spend less time there.

What Factors Influence the UGR Values?

In addition to the fact that the UGR depends on the lamp itself, the fixture can also influence glare. A fixture that is highly reflective will cause a higher UGR than a mattefixture. The surfaces in the room can also have an impact. Smooth, reflective desks, for example, will more likely cause glare, as the light reflects off them. Furthermore, the position of a workspace can determine whether one experiences discomfort from the light. All in all, there are many factors that affect the UGR, and thus the experience and comfort of the space.

Want to know more about how to prevent or reduce glare? Feel free to contact us! The Qub lighting experts team is happy to assist you.