Hi
I have read your concerns and would just like to give an opinion. I have whites tree frogs and always observe them everyday.My views are this,they always rest during the day up in the top half of the vivarium.They only come down to ground level during the night to bath and eat. I give all my frogs a midday spell (2hours) of a uv light(includes horned frog) they can take it or leave it by hiding but I have observed that my frogs have better colour ,look healthy and are more active.There has been posts relating to the dreaded neon spots illness .I purchased a whites frog a while back and the symptons were lethargy,staying on the ground and greeny neon patches.I use beaphar dienfectant on all my implements and vivarium cleaning.I buy still spring water for the frogs pools and cleaning,handling(moist hands only).they need spraying every day but not saturated conditions .observe the temperature and humidity and note that your vivarium smells good.Whites do not like stagnant and poorly ventilated vivs.This post is my opinion only.
regards
Keith