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What is UGR19 Anti-glare LED Light?


December 9, 2019

UGR19 stands for Unified Glare Rating of 19 or less, which is a parameter of how bright a luminaire is in a sample room layout, and is particularly important in office spaces where workers have to spend many hours a day and would be using display terminals for a large proportion of that time.

The higher the UGR number the higher the glare from the luminaire and the increased discomfort for office workers. The glare can cause health and safety issues and welfare problems such as headaches, migraines, and eyesight issues. The light fitting alone cannot be UGR19 compliant as it is not a characteristic of a luminaire but is a measure of how it performs in a physical space.

The UGR rating helps to determine how likely a luminaire is to cause discomfort to those around it. For example, the discomfort that a LED Panel will cause the workforce within an office. This classification ranges from 5 to 40, with low numbers indicating low glare.

Glare is a common problem in workplaces. Inappropriate luminaires cause excessive brightness to be ‘bounced off’ reflective surfaces, such as computer screens, whiteboards, etc. This can cause disruption for the occupants of offices, in terms of headaches & eye trouble, which can then lead to employee absences.

Table of Contents

Calculating UGR

UGR is calculated by using an equation that takes into account a number of factors that may contribute to glare caused by a luminaire, such as the angle of the luminaire, the likelihood of glare and the luminance value (lumen output). The equation that is used to calculate the UGR is:

L= The luminance value of the luminaire

Lb= The value of the background luminance

ω= The solid angle of the luminaire that is seen by the viewer

p= The Guth Index. Based on the likelihood of glare, also known as Visual Comfort Probability

Σ= Shows that the equation (shown above) includes all the fittings located within the area.

Methods for Reducing Glare:

There are two methods to reduce the glare that is present in relation to interior lighting: firstly, to use luminaires that are UGR<19 rated; secondly to ensure that the lighting design is appropriate for the environment they are being used in i.e. the correct number and position of luminaires.

Within an office setting, for the luminaire to be classified as “low glare” it must have a UGR below 19 at desk level. Anything above this may cause discomfort – this further enforces the need for high-quality interior lighting that is rated UGR<19.

There are a number of different UGR limits that should not be exceeded in certain environments, these include:

UGR RatingEnvironment
UGR ≤ 16Technical drawing
UGR ≤ 19Reading, writing, training, meetings, computer-based work
UGR ≤ 22Craft and light industries
UGR ≤ 25Heavy industry
UGR ≤ 28Railway platforms, foyers

How Can TUBU help?

TUBU offers free expert lighting designs to make sure that the correct type and number of luminaires are being used within a certain area.

TUBU Anti-glare UGR19 UGR22 Tubular Light IP67 IP69K

TUBU Anti-glare UGR19 UGR22 LED Linear High Bay Light IP65

TUBU Anti-glare UGR19 UGR22 LED Round High Bay Light IP65

For more information about low glare lighting or any other lighting advice contact us on +86-84615006 or email sales@tu-bu.com.

About the author

TUBU is an expert in LED light research with more than 10 years of experience in this field. We hope that through our TUBU research, LED lighting technology will become more popular and bring greater convenience and comfort to people's lives.

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