ASYMMETRICAL VS. SYMMETRICAL LIGHTING
What is it and which is best for sports lighting?
Asymmetrical lighting severely limits vertical lighting.
To address this weakness, some manufacturers add additional fixtures and aim them toward the sky.
WHAT IS IT?
Asymmetrical lighting creates a beam of light where the horizontal axes can differ greatly from its vertical axes.
WHY IT'S GOOD
LEDs with TIR lenses have allowed for very precise lighting focus on surfaces, thereby making it a great choice for road or pathway lighting. In these applications, horizontal foot candle levels are much more important than vertical foot candles.
WHY IT'S WRONG FOR SPORTS
Sports are not just played on a surface. In a 3D environment, an asymmetrical lighting fixture is not an appropriate option. Players quickly lose site of the ball in the dark. The only way to overcome the lack of vertical foot candles is to aim lights straight up.
AIMING A LIGHT STRAIGHT UP INTO THE SKY IS NOT "TECHNOLOGY"
It is compensation for an inherent weakness in the product