Yes do the 24 inch long tube, no coiks/compact uvb bulbs, they are horrible. You can put the 10.0 t5 on top of the screen, just make sure henry can get close enough to it. As for basking, please use a clear bulb, colored bulbs hurt there eyes. I would start with a 100 watt and check the temps, that will give you a base line to work with. I have had issues with the ZooMed fixtures, i switched all mine to Arcadia.
Welcome to the forum and congratzz on your beardie, they are wonderful pets.
Feel free to ask about anything at all, there is someone here that can answer about any questions you might have.