What is the glare rating for sports lighting?
Glare ratings for sports lighting are defined by indoor (UGR) and outdoor (GR) standards, with technical requirements as follows:
1. Indoor Sports (UGR)
Luminaire luminance ≤2.500 cd/m².
Asymmetric optics (e.g., 110°×60° beam) with microprismatic diffusers.
Background-to-source luminance ratio <1:5.
Standard: CIE 117-1995 / EN 12464-1.
Target: UGR ≤19 (e.g., basketball courts), UGR ≤22 (gymnasiums).
Control Methods:
2. Outdoor Sports (GR)
Full cutoff fixtures (upward light <2%).
Luminance ≤5.000 cd/m² at 85° tilt (per FIFA).
Mounting height ≥12m (for 500 lux fields).
Standard: CIE 150:2017 / EN 12193.
Target: GR ≤50 (football), GR ≤40 (tennis).
Control Methods:
3. Dynamic Glare Mitigation
Frequency: >3.125 Hz driver (IEEE 1789 compliance).
Smart Dimming: Post-event reduction to 30% illuminance (e.g., 750→250 lux).
4. Validation Tools
UGR: LMK Photometer + DIALux simulation (error <5%).
GR: HDR imaging luminance meters (e.g., TechnoTeam LMK 5).
5. Related Product
