Quite OK to use a MVB + a T5HO 10%UVB or T5HO 12%UVB tube in your tank, simply means the UVB tube need not be as long as it would need to be if the T5HO tube was the ONLY source of UV.
I think you will find MVB over basking spot and a T5HO tube about 1/2 the length of the tank mounted so it starts about 1/3 the way from basking spot end of the tank will work just fine.
@King... so this is what I have right now...
I dont have the correct UVB tube in there yet (its the one that came with the zoomed hood 5.0 tube) and Im not sure a t5 HO 10.0 will give off any more heat or not. I just turned everything on, gave it about 10 minutes and with the 150w Exo terra basking bulb... Im only getting about 80f+. What I am realizing is the mesh screen on the zenhabitat is a "hard mesh" and not like a "screen door" type of mesh. Would you still recommend using the Powersun with T5 HO outside or just find a way to get the T5 HO inside?
What are the recommendations for reflectors for inside use? I do have the Reptisun 34" 10.0 T5 HO tube on order and coming in a couple of days but now Im thinking if it was the right choice? Or should I get something smaller and just find an inside reflector and figure out how to mount it inside?
Not perfect but workable if you make a few small changes.
>> mesh under the MVB & T5HO tube is quite fine and will be blocking up to 45% of the UV from the MVB and the T5HO tube.
Best to remove the mesh entirely and replace with a piece of MDF or plywood with a hole cut for let the MVB shine in , and the T5HO hood mounted under the lid.
This will make it easier to set up a stable thermal gradient in the tank and you'll find you'll not need as high a wattage MVB to get the same temperatures.
>> a T5HO 5% UVB is not going to strong enough , you still need a T5HO 10 - 12% UVB , or a T5HO 14% UVB tube if mounting ONTOP THE MESH.
Ideally you want about 100 microW UVB / sq.cm in the area midway between the basking spot and the cold end of the tank , a T5HO 5% UVB tube will never give enough UV at the distances shown.
T5HO tubes don't add much heat at all.
>> basking spot needs to be directly under the MVB and the temperature at the basking spot no hotter than 100-105 F ( I try to keep my bearded dragon basking spot at 37 - 38 degC and never hotter).
It's fine if the basking spot is the tree branch if this is wide enough for the dragon use safely as its basking spot.
I use a jumbo sized Hubbahut for my basking spot for my dragon , simply climbs ontop to bask, my girl Peppa is 25" long and about 800g.
>>> Measuring technique might be giving you low temperature readings , see this :
points to make sure of
> the place being measured needs to be smaller than the measuring spot of the thermometer
> the emissivity needs to be right for the surface
> if reflective surface avoid measuring the reflection of the heat source.