I hope you got both your beardies a proper long, flourescent, UVB tube by now. You definitely do want the Reptisun 10.0 UVB tube, but it has to be a long tube, either 18" or 24" long at a minimum length, inside a matching long, flourescent tube fixture with a reflector behind the tube and no clear plastic safety cover on the fixture, and over the UVB tube. There are 2 different strengths of Reptisun 10.0 UVB tubes (you NEVER want a Reptisun 5.0 tube, they are for tropical reptiles and do absolutely no good for beardies)...The 2 strengths of the Reptisun 10.0 UVB tubes are the T8 tube and the T5 High-Output tube. Either strength of Reptisun 10.0 UVB tube is fine for beardies, but they do differ in that they have different requirements for how to mount them and when to replace them.
The Reptisun 10.0 T8 UVB tube is the weaker if the tow tubes. It absolutely must be mounted under the mesh lid and inside the enclosure, as the T8 tube is not strong enough to penetrate the mesh lid, so up to 50% of the
UVB light emitted is blocked, and the T8 tube is not strong enough to overcome the mesh lid. The T8 tube must also be mounted inside the tank and under the mesh lid at a distance within 6"-8" of his main basking spot in order for him to absorb adequate
UVB light. Also, the T8 tube must be replaced every 6 months, as it stops emitting
UVB light at that age even though it still turns on and emits general light. The Reptisun 10.0 T5 High-Output UVB tube is strong enough that it can rest on top of the mesh lid (never on glass though, no
UVB light, including natural sunlight, penetrates glass), but the T5HO still must be within 11" of his main basking spot for him to get adequate
UVB light. Also, the 10.0 T5HO tube must be replaced every 10 months to a year, as it stops emitting
UVB light at that age.
Without one of these long, flourescent UVB tubes, your beardies cannot manufacture any vitamin D3, which makes them unable to absorb any nutrition or Calcium/multivitamin powders you're giving them, and this is how they develop the MBD and the gout. I would highly recommend the Reptisun 10.0 T5 High-Output UVB tubes, I've used only these (and one Arcadia 12% tube once, which is the other fantastic brand of beardie UVB tubes) and never had a beardie with a single illness, not even parasites, and my prior boy lived to almost 13 years old. Both your beardies would benefit greatly from the Reptisun 10.0 T5 High-Output UVB tubes, 18" is fine, as they both have serious life-long diseases that proper wavelength and strength of
UVB light can remedy and even reverse. Right now Amazon.com has the 24" 10.0 T5 High-Output UVB tubes on sale for $24.99 a piece (less than the cheaper T8 tubes), and once you select the tube, if you scroll down the page they offer a package deal that also includes a matching 24" T5 flourescent tube fixture. It's the best investment you can make for your beardies if you're still using the 13 watt compact Reptisun 10.0 UVB bulbs.