Usually the heater used for the water is enough for amphibians, as warm water heats up the air. However, for reptiles, which tend to stay most time out of water, a heating bulb would be a fine complimentary heater. Just about any bulb is fine, even fluorescents give enough heat to warm up the air, but due to ventilation, not much is accomplished with them. I recommend dicroic reflector halogen bulbs because I have hade good experience with them, but incandescents will do the trick too.
Heating rocks are supposed to be water resistant, unless they are the porous type they will soak.. As long as the wire junction is well sealed, it shouldn't be much of a problem using it on the emersed land part.
What kind of reptiles are you thinking about?
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