Arcadia has some guidelines http://www.arcadia-reptile.com/wp-co...belly-toad.jpg
Keep in mind these recommendations are when the tube is used inside the tank with a reflector, a tube over mesh loses a lot of potentency, so you go from a 2% minimum inside the tank to a 5% outside and so on, depending on the distance from the light and frogs





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other two are fine
