Im wondering what it means when my female veiled turns a solid lemon color almost completly yellow? She is about 4-5 months and i have never seen this she has no other color showing but solid yellow and white stripe on her side .
Based on the temps you describe and the fact that color change is one of the ways chameleons regulate their body temperature (darker to absorb heat/ lighter to reflect it) my guess is that she is too hot.
I would also suggest a basking spot of 80, or no basking spot at all if the temperature at the top of the cage is close to that.