I just recieved my solar meter 6.2 and I have some questions I hope someone can answer. I have a veiled cham and a flouresent linear 5.0 uvb bulb. What are good numbers for the basking spot which is 6 inches down from the top. what reading indicates the bulb is too low. At the standard distance of recording which is 12 inches from the bulb, what are good readings suppose to be? What reading indicates that the bulb should be replaced?