UV, no fluorescent, ordinary bulbs are ok but I don't think 18 hours a day of ordinary bulbs would be good either.
cool location with low humidity, desiccant can help.
And yes like Mike said, sometimes the leather of the ball can hurt, it is animal hide, I have two SS balls, one Hubbell, one Terry, very lightly toned when I got them, they are now and always have been in a dark dry room, and now they are colored a deep tan
.
That is one of the reasons that my autograph collection consists of far more flat items than baseballs.
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"I have never killed a man, but I have read many obituaries with great pleasure."- Clarence Darrow