Is the reptiglo 10 a coil/compact or a long tube? The coil and compacts are very bad and it's best to turn them off because of what they can do to beardies, this includes the reptisun 10 coil
uvb bulb.
If your reptiglo 10 is a long tube, you can safely put the bulb 10" away from your dragon's basking spot, then when you get the reptisun 10 tube, put it between 6 and 8 inches from the basking spot.
I hope this answers your questions.