Q: How to control glare and ensure uniformity of LED floodlights in sports venues?

Glare evaluation is primarily based on Glare Rating (GR) ( Reduce glare – UGR, GR and Ti in lighting design ). The GR at any location on the field should be controlled to ≤50 (for broadcasting) or ≤55 (for local matches), with key viewing areas (such as behind the goal and the front of the sideline public areas) requiring particular attention. To ensure image quality, the vertical illuminance in the spectator area should be no less than 0.25 times the vertical illuminance of the field. These indicators should be included as constraints in the simulation and verification process during the design phase. Uniformity is recommended to be controlled using two indicators: U1 = Emin/Emax and U2 = Emin/Eave. The horizontal illuminance uniformity of the playing field should be ≥0.5, and the uniformity of the key vertical plane facing the main camera should be ≥0.4; broadcasting/HD events usually require higher values (e.g., U1h ≥ 0.60, U2h ≥ 0.80). Simultaneously, the illuminance change between adjacent grid points should not exceed 20%, and the ratio of average horizontal illuminance to average vertical illuminance should be between 0.5 and 2.0. Illuminance levels and target values should match the level of the event: approximately 200 lx for training/recreation, 500 lx for amateur matches, 750 lx for professional matches, 1000 lx for general TV broadcasting, and 1400–3500 lx for large-scale international HD broadcasting; the ratio of vertical illuminance to horizontal illuminance (Ev/Eh) is recommended to be approximately 0.5–0.75 to balance three-dimensionality and image quality.

Q: Typical Illuminance Reference Values for LED Floodlighting in Common Scenarios

Application Scenarios Reference Illuminance Industrial Plants and Workshops (General Areas)100–150 lxWarehousing and Storage Yards150–300 lxParking Lots and Passageways50–100 lxPetrochemical Plant Areas200–500 lxTunnels (General)100–300 lxDock Decks/Storage Yards≥50 lxBuilding Facade Floodlighting (Decorative)15–450 lxSign/Billboard Floodlighting100–500 lx

Question 1

Application scenarios for LED floodlighting

Accepted Answer

Outdoor areas and building facades: Used for large-area uniform lighting and facade wall washing in parks, gardens, sidewalks, building exterior walls, etc., emphasizing wide coverage, sufficient brightness and weather resistance. Common installation positions include walls, columns, eaves, ground bases, etc.

Commercial retail and display: Enhance the visibility and attractiveness of store fronts, windows and key displays, suitable for new product launches, promotions and other scenarios that require flexible lighting.

Sports and event venues: Provide high-illuminance and high-uniformity lighting for football fields, basketball courts, tennis courts, athletic fields, etc., and take into account color rendering and glare control.

Industry and warehousing logistics: large-area operation areas such as factories, workshops, warehouses, and docks, emphasizing high efficiency, energy saving, long life, and stability and reliability.

Urban infrastructure and transportation hubs: public spaces such as parking lots, stations, subway stations, bridges, and overpasses, taking into account functional lighting, safety, and image.

Billboard and landscape lighting: billboards, signs, sculptures, landscape avenues, trees, etc., highlight visual recognition and nighttime beauty, and often achieve dynamic effects with the control system

Question 2

How to control glare and ensure uniformity of LED floodlights in sports venues?

Accepted Answer

Glare evaluation is primarily based on Glare Rating (GR) (Reduce glare – UGR, GR and Ti in lighting design). The GR at any location on the field should be controlled to ≤50 (for broadcasting) or ≤55 (for local matches), with key viewing areas (such as behind the goal and the front of the sideline public areas) requiring particular attention. To ensure image quality, the vertical illuminance in the spectator area should be no less than 0.25 times the vertical illuminance of the field. These indicators should be included as constraints in the simulation and verification process during the design phase.

Uniformity is recommended to be controlled using two indicators: U1 = Emin/Emax and U2 = Emin/Eave. The horizontal illuminance uniformity of the playing field should be ≥0.5, and the uniformity of the key vertical plane facing the main camera should be ≥0.4; broadcasting/HD events usually require higher values (e.g., U1h ≥ 0.60, U2h ≥ 0.80). Simultaneously, the illuminance change between adjacent grid points should not exceed 20%, and the ratio of average horizontal illuminance to average vertical illuminance should be between 0.5 and 2.0.

Illuminance levels and target values should match the level of the event: approximately 200 lx for training/recreation, 500 lx for amateur matches, 750 lx for professional matches, 1000 lx for general TV broadcasting, and 1400–3500 lx for large-scale international HD broadcasting; the ratio of vertical illuminance to horizontal illuminance (Ev/Eh) is recommended to be approximately 0.5–0.75 to balance three-dimensionality and image quality.

Question 3

Typical Illuminance Reference Values ​​for LED Floodlighting in Common Scenarios

Accepted Answer

Application ScenariosReference IlluminanceIndustrial Plants and Workshops (General Areas)100–150 lxWarehousing and Storage Yards150–300 lxParking Lots and Passageways50–100 lxPetrochemical Plant Areas200–500 lxTunnels (General)100–300 lxDock Decks/Storage Yards≥50 lxBuilding Facade Floodlighting (Decorative)15–450 lxSign/Billboard Floodlighting100–500 lx

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