The yellow Glo ball leaves off a vibrant green glow , perfect for training during dark winter night or during the day.
The UV light sold with this elevates the brightness off the glow and makes it glow longer in a shorter period off time. Every second with a uv light is the equivalent to 8 seconds with a torch
Irecommend this ball to be used when light is fading as it is best for those times when you can just about see the yellow ball mixed with the glow off green , for a ball to be used in pitch dark i recommendthe white ball with green glow.
