New Pacman Frog-need heating help

[Ra]

Personally i would with the 5.5 inch reflector lamp and a 50 watt red bulb connected to a dimmer or rheostat. If I were shopping at a pet store. I usually get my stuff at Home Depot, I keep my house at about 74 Fm so I use a 25 watt red bulb and buy the 5.5 inch clamp lamps they have for about five bucks. 25 watt bulbs seem to work perfectly in a 10 gallon, but I also paint three sides back and put cardboard on three sides which helps the tank hold heat.