Corns don't need UV. But hey, if you want a light on there because it looks cool, go for it. I have my display vivs lit up during the day. You might want to think about putting the light on a timer. You can get one at Walmart (or similar) for about $4. Personally, it saves me the trouble of remembering to turn the light on and off each day. It's also nice not to have to worry about being gone all night and leaving it on.