Purpose of using yellow balls?
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Now when it comes to a sport like tennis, I understand why the ball would be yellow; because it is easier to follow and focus on. In golf, that would be an irrelevant fact. Most people I have talked to say they buy them because they look cool, which I what I would say if asked a question like this. Anyway, what does anyone think is an ADVANTAGE to playing with yellow golf balls?
Because they believe the ball is easier to follow and find.
I used yellow Srixon balls yesterday.
It was easier to work out which ball was mine while walking up the fairway as everyone else was playing white balls.
I also think there's an advantage that there is less chance of someone in another group mistaking your ball for theirs and playing it (as happened to me last week despite my ball having clear markings).
I can tell you that the Tour yellow Srixons are easier to see in the air and in the rough than a white ball. They more than just yellow, they have little what I'd call sparkles in them to make them even more visible.
Different balls have different shades of yellow. I like those balls with light shades of yellow, like the NXT Tour S. Very easy to see. It almost seems to glow.
On the other hand, my favorite ball is the Srixon Q Star, but its shade of yellow is darker and with a hint of green. I don't like it and I don't find it easier to see on the fairway. So I rather use the Q Star in white.
I suspect it involves individual differences of the human eye. For non-white balls, my all time favorite was different brands of orange balls. I found them very easy to track, even on cloudy days in the spring and fall when a white ball "disappears" 50 yards down range. Wayward shots were easy to spot in the rough.
Yellow balls were OK, expect on cloudy days. I found the lime green balls almost impossible to use - hard to track on bright sunny days... if a lime went into the rough, it was like I had to step on the ball to find it.