I got Ultatherm from Rich 2 weeks ago on the show.. and I just Love that stuff.. Those are low wattage UHT and those dont go over 95 degrees so are more safe than rest of stuff on the market...

For 40 Gallon 11x17 : http://www.reptilebasics.com/ultrath...ter-uth-11-x17 will do in my opinion. Will cover nicely almost 1/3 of the floor