Quote:
Originally Posted by Pirarucu
Yes, too much UVB can be very bad. Too much for humans results in sunburns and eventually skin cancer. However, you will find that providing too much for reptiles using artificial lighting is very hard to do unintentionally.
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Actually this isn't true with metal halide lamps (it is with fluorescent tubes). Different brands suggest different minimum distances between the lamps and the animals (usually 20-30cm) to avoid any harmful effects of too-high UV levels.
This can be exacerbated if your lamps need conventional external ballasts (such as the lucky reptile lamps). This can cause a flickering in the bulb (sometimes invisible to humans) which the lizards can see and can cause them to spend large amounts of time staring directly up into the bulbs. If you notice this happening, you should change the ballast to a higher current version, or move the bulb further up to avoid photokeratitis.
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