search

LED Panel Store

01652 638850

What Are UGR LED Panels?

What Are UGR LED Panels?
04/09/2020

UGR stands for Unified Glare Rating. It’s a mathematical way of describing whether a luminaire is likely to cause glare.

What is glare? Glare is the effect that occurs when two sources of light are present simultaneously in a person’s line of sight. An example most people will be familiar with is when the headlights of an oncoming vehicle at night make it very hard to see the road ahead. The same can happen in an office environment when badly designed lighting reflects off the computer monitor making it hard to see what’s on the screen.

Even when computer screens are non-reflective, the advent of high efficiency edge-lit LED panels has tended to result in higher illuminance levels, with all of the light delivered at the diffusing surface of the luminaire, not deep within a reflector / louvre system. The 100% direct illuminance from standard LED panels means the surface of the panels is very bright when compared to the background, giving glare!

How is glare measured? The UGR rating is calculated using an equation:

UGR = 8 log [0.25/Lb Ʃ(L2Ω/p2)]

L represents the luminance value of the luminaire Lb is the value of the background luminance

Ω is the solid angle of the luminaire as seen by the viewer.

p is The Guth Index. This is a factor based on the likelihood of glare, known as Visual Comfort probability.

The Sigma sign (Ʃ) means that the equation includes ALL fittings within a space.

You can see from the above that a UGR calculation can only be accurate when applied to a physical space. It cannot be measured in a test room.

How was glare controlled before LED? When desktop computers were first introduced there were serious problems caused by the reflection of light fittings in the shiny highly reflective screens. This was dealt with in two separate ways:

The monitor manufacturers started to produce non-reflective screens CAT2 fluorescent light fittings were introduced. These reduced glare by having a 65° cut-off.

Both methods have their own disadvantages:

Matte screens have a reduction in contrast and colour vibrancy, Slight to moderate reduction in sharpness – depending on thickness and layering of matte surface as well as monitor pixel pitch, Generally more difficult to clean due to dirt penetration, and Grainy or hazy texture apparent in some instances, particularly when displaying white and other light colours

The disadvantage of the CAT2 luminaire is obvious from the picture– it’s just ugly!

For more information on  What Are UGR LED Panels?  talk to  LED Panel Store

Enquiry Form



More News

The Advantages Of LED Lighting Panels

The Advantages Of LED Lighting Panels

Businesses considering how to make the most of their bricks and mortar stores should certainly consider looking into the benefits of LED lighting pane...

Read More
Why Invest In LED Panels?

Why Invest In LED Panels?

Innovative LED panel lighting solutions are becoming the go-to option for many homeowners and businesses across the country. But what makes LED panels...

Read More
How To Light Your Warehouse

How To Light Your Warehouse

All businesses accept that warehouses are a necessary burden to their business, so lighting them should be as simple and cost-effective as possible. B...

Read More

Read More

Read More

List your business

Would you like to register your company on one of the UK's largest and most effective Trade websites?

Are you looking for a reliable and consistent source of enquiries from your industry sector? Would you like to see why Find the Needle clients come back year after year to use our service? If so then feel free to register using the link 'here'.

Register
Office Address: