I would just get one of the 40 watt heat wave IR heat lamps(they are ceramic and emit only infared light and they last for years) from Exo Terra. I would mount the lamp on a telescoping fixture in case you need to adjust the distace from the terrarium. You'll have to monitor the temps for several days to make sure it's keeping the correct temps in the terrarium. At night, I would advise a temp drop. This can be done by adjusting the lamp away from the terrarium(or if there is a natural drop of temps in your house, that would probably suffice). Even on the 40 watt, the ceramic itself gets really hot, so never let it touch any part of the terrarium-it will melt any plastic and/or could cause the glass to crack or shatter.