Glare control in sports lighting: Why is GR≤30 a key performance indicator for competitions?

In sports venue lighting projects, glare control is an increasingly important focus for venue operators and event organizers. In a competition, athletes being blinded by lights, referees making incorrect calls, and spectators complaining about glare—the root cause of these problems is often glare. So, what is glare? How is glare quantified in sports lighting? Why has glare control become a key performance indicator for sporting events? Today, we'll explain this thoroughly from a professional perspective.

What is the glare index?

Glare refers to visual conditions that cause visual discomfort and reduce the visibility of objects due to unsuitable brightness distribution or extreme brightness contrast in space or time. In layman's terms, it's "eye-straining" light.

In sports lighting, glare is measured using GR (Glare Index). According to the "JGJ153-2016 Standard for Lighting Design and Testing of Sports Venues," different levels of competition have specific limits on GR values: indoor venues require GR ≤ 30, and outdoor venues require GR ≤ 50. The lower the GR value, the less glare and the more comfortable the visual experience.

Why does glare occur?

Glare is mainly caused by: excessively bright lights, improper installation angles, and light shining directly into the direction of the athlete's or camera's line of sight.In sports venues, failure to control glare can have serious consequences:

• Impact on athletes' performance: When basketball players shoot or goalkeepers make saves, looking up directly at the headlights can cause them to be blinded by the lights, leading to misjudgments.
• Reduced broadcast quality: Cameras captured glare, resulting in light spots on the screen and negatively impacting the viewer's experience.
• It can cause visual fatigue: When athletes and spectators are in a glaring environment for a long time, their eyes are prone to dryness and fatigue.

Therefore, modern sports lighting design must take a series of measures to control the GR value within the standard range.

How do SCL achieve superior glare control?

SCL has adopted a range of specialized technologies in glare control:

• Anti-glare lens: In collaboration with a German optical laboratory, it adopts a TIR total internal reflection design with a light transmittance of more than 90%, precisely controlling light to ensure that every beam of light is projected to the required position and avoiding scattered light from shining directly into the eyes.
• Optical coated tempered glass: 4mm AR tempered glass, high light transmittance, low reflection, anti-glare, light transmittance of up to 98% or more, and impact resistance rating of IK08.
• Light-shielding shield: The diffuse reflective surface is designed using Matlab algorithms to improve visual comfort, effectively control light spill, and avoid light pollution.
• Precise installation and debugging: The construction team strictly adjusted the lamp angles according to the projection diagram, and the dual-axis adjustable brackets were marked. After debugging, the installation was checked from the athlete's perspective to confirm that there was no glare.

Based on its professional strength, SCL has built a complete sports lighting product matrix, offering specialized solutions for all categories of sports, including basketball, football, table tennis, badminton, swimming, and winter sports, achieving precise light distribution. It is one of the drafting units for the national standards "Technical Requirements for LED Sports Lighting Applications" and "Standard for Lighting Design of Outdoor Work Sites".

Leveraging its profound technological foundation and rich practical experience, SCL has successfully served numerous events, including the FISU, Asian Games, Military World Games, World Middle School Games, National Games, Provincial Games, WTA, CBA, NBL, Chinese Super League, UEFA, Africa Cup of Nations, ITTF, BWF, and FIE, forming a comprehensive service capability covering all scenarios such as international events, professional leagues, professional training, mass fitness, and campus sports.