Hey,
No they are not moveable. There are mounted through a hole in the extrusion. I did however remove the driver/power supply unit off the top of the fixture. That really helped. It's now lighter and can bend in the middle on the hinges. Makes it easier to direct the light a bit. You may be able to see that in the pictures. I'll take some more to show that specifically.
I'm using 48" T5 HO bulbs for my UV. AgroMax's Pure UV 75% UV-B, 25% UV-A and UV-A Plus 10,000K with an added UV-A They are in those cool SunBlaster fixtures. I have them suspended above the fixture in the open spaces between the bars. Simple and easy. I looked into UV in an LED but just not viable yet for me. Too expensive and not enough output. Soon maybe, but not just yet. Can't wait to add my supplemental lights, the blue , green, and reds, but that will have to wait until this grow completes. Want to give a fair showing of the light they gave me to review!