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As far as I know there is no harm in using UVB. There have been a few studies done that say you can get some nicer looking babies from adults that were given UVB. But they are not conclusive. The results of the babies coloring was very minuet. But to answer you ? no you do not need UVB.
I wouldn't use UV. Corns have no need for UV in captivity as they're not a basking species and have never developed a dependency on it in the same way that some reptiles have.
In the wild, they avoid coming out at times of strong sunlight and only come out when there's weak/no light (dawn/dusk/overnight). This means that putting a UV light in the tank risks them hiding even more than usual.
Also, there's anecdotal evidence (although no formal study or confirmation) that it can be the cause of blindness in lighter morphs lacking the protective melanin e.g. Snows, Amels etc.
UV is really just an unnecessary expense for a Corn.
Corns don't need constant UVB. As long as you have a window in the room, the light that comes in from that should be fine. They don't need to light for digestion or to produce calcium.
No harm in using a UVB bulb, but it's not a must, either. Like someone else said, they don't bask like other snakes do. Keep in mind that UVB bulbs do not emit heat like a heat lamp though, so don't use one as a heat source.
No harm in using a UVB bulb, but it's not a must, either. Like someone else said, they don't bask like other snakes do. Keep in mind that UVB bulbs do not emit heat like a heat lamp though, so don't use one as a heat source.
My concern with this advice is that corns are primarily ground dwellers. They generally seek out warm areas like rocks or stumps to warm up, avoiding direct sunlight due to predation. Putting a UVB light over an animal that isn't geared toward dealing with constant light, could be damaging to it's eyes. Corns don't blink. JMHO!