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.

ASYMMETRICAL LIGHTING
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

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SYMMETRICAL LIGHTING
WHAT IS IT?
Symmetrical lighting creates a beam of light where the horizontal and vertical axes are equal.
WHY IT'S GOOD
Unless the goal is to only light a 2D surface, symmetrical lighting provides a far better area light. Not only will it provide the horizontal foot candles needed, it will also provide the vertical foot candles.
WHY IT'S THE ONLY CHOICE FOR SPORTS
Today's facility managers have a number of requirements placed upon them. They must provide great lighting for the athletes, make it comfortable for the fans and make their fields as dark sky friendly as possible. Only symmetrical lighting can accomplish all three.