this only glows after it absorbs light. but when it is dark, where is the light going to come from?
i kept 2 balls in the garage with the lights on so the balls would absorb the light. rotating them in when the ball in use loses its glow. well, it would lose it in about 5 minutes? after a while, i stopped rotating. even without glow, it is still easier to see than a dirty orange or red ball.