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There are may discussions on what type of light should be used, for turtles in captivity. Nothing can replace the natural sunlight, the animals "need". Personally I know people that are keeping there turtles indoors for about 25 years now, and the only light they see is the one of a light bulb. I'm not saying that's the answer, but the animals don't seem to have any complaints. Natural light gives the turtle vitamin D3, or if not present a substitute can be given. Do not give the animal vitamin D3 if it stays outdoors. There are many types of light that can be used. Tubes together with normal light bulbs make the better combination. The tubes give a broad spectrum and much light. Light bulbs give fewer light but give heat, what is needed to let the turtle bask. Light bulbs or spots are necessary, not only to give light but for the heat they produce. This way a water heater is not necessary. Make sure that the animals can't reach the light bulbs because they will burn themselves. Be careful with what kind of material u use. Don't use 100watt light bulbs in sockets for light bulbs that are suited for 60 watt bulbs.  You can either make you own light combination or buy one in a store. There are many different ways of constructing a light hood, all depends on how the tank is used, and where it's placed in your home. Give your animals a natural rhythm when it comes to light. This means give the turtles a lightning period of 8 hours during the winter months and about 12-14 hour in summer. Set the lights with a timer so the animals daily get the same time of light. Go with the seasons, from jan on 8 hours, feb 9 hours, mar. 10 hours and so on until sept. when you start back again. This lightning method will also stimulate breeding, this together with a cooler period in winter time. A light hood also has the advantage that the humidity stays high. Using dubble sided polycarbonate plates are ideal for this. This material is easy to handle and holes can be made into them for the light sockets.

Before you install uv lights above your turtles read this (click/link )