My beardie's new cage is 47"x36"x18", and I got her a 24" ReptiSun T5 10.0 bulb/fixture. Where should I mount this? Inside or outside? If inside, should I put it in the center of the ceiling or on the back wall? And since it's only about 1/2 the length of the cage, should I put it off to one side or in the center? I hope this makes sense. Thanks in advance.