They do need dark at night, but if you just want some light to watch them for a bit while they're up and about, then any light will do, preferably a low wattage to allow you to see them without lighting up the room. About all that light you have will do is cast a bluish light, makes it seem darker to you but it will still be bright for them (and produces heat which they won't need unless they're in a very cold room.)
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