What type of chameleon is it? How old is it? Male or female?
A youngster would want a basking spot of no more than 80F, babies need no basking spot at all.
And adult male veiled wouldnt mind a basking spot of up to 95F, ambient in the mid 70s
And adult female that you dont want to lay eggs should get less heat
And Adult male Panther would be fine with a basking spot of up to 90F, mine are at 85-90F depending.
Montaines are somewhat different again