You don't say what the temperature is in the basking area.
If he's hiding and inactive when the heat lamp is on, he seems to be telling you it's too hot for him. Maybe you just need to use a lower wattage bulb.
80 degrees room temp is rather warm and a basking area should only be in the low 80s.
A drop in temperature at night is best and keeping the humidity up is essential.
Jackson's can be rather difficult to keep well hydrated.
Usually, you won't see them drink.
I think I saw mine drink ONCE in a year's time, if at all.
The best way to know that he is getting enough to drink is to monitor his urates (the white part of his poop). It should be nice and pearly white, definitely not orange. Orange indicates he's dehydrated.
A misting system is a great help with them and they should have a dripper going all day, as well.
My dripper is a one gallon milk jug with a piece of aquarium air tubing attached with an air valve to regulate the drip speed.
Awesome cage you made for him!
You can search through past posts for lots of Jackson's info, but there are some excellent links posted by Xanthoman in post #12 of this thread:
https://www.chameleonforums.com/jacksons-overview-40283/index2.html
Xanthoman has taken his forum name from the Jackson subspecies Xantholophus--which offers a hint that he knows proper Jackson's care.
I almost forgot to add that "montane" species, such as Jackson's are susceptible to oversupplementation with vitamins and calcium. Too much is as harmful as too little.
Xanthoman has recommended:
"calcium without D3 2x a week, calcium with d3 once a month, and multivites (with proformed vitamin A) once every 6-8 weeks (all in sparing amounts) should be plenty, maybe even too much for a xanth that gets regular outside sun. herptivite (proformed vitamin A) is probably safer than reptivite (preformed vitamin A)."
