Well, I have MVB and am still not a believer in them. But anyway, they need to be a minimum of 18" from the animal. Zoo Med sells a stand that is adjustable so that you can move the light higher/lower. A timer is very important. Most of the way that animals sense the changing of the seasons is by the change in the day lengths. In your case the day lengths are kinda random (within reason obviously) and may be confusing your dragon. Possibly causing an early brumation.

Like HH said you need to get those temps down. I assume that you have him in a cage that is too small. I find it difficult to get temps. right on even in a 4' x 2' enclosure which is the minimum recommended size for an adult. The ambient temp. on the HOT side should be high 80's to the very low 90's. Away from the spot beam mine run about 88, nearer to the beam 91. So your cool side temps. are actually warmer than my hot side. With your setup he has no ability to cool down and thermoregulate.

I think the temps. are your primary problem and should be corrected right away. He's hiding and not eating because he is just plain too hot.

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