i agree i wouldn't put a bulb inside the viv either, but if you must you need to cage the bulb in somehow, and by the looks of that bulb it won't be easy as thats some high wattage and will get hot and anything around to cage the bulb would as well. If it were me i wouldn't use it at all, and definitely not inside the tank. if you want something moon light or night light you can buy a simple LED light stick