This is from the Panther Care Sheet.
Panther Chameleons - General Care
Temperature:
Baby/juvenile (<9 months): ambient 72-80F (22-26C), basking 82F (28C)
Adult males: ambient 75-80F (23-26C), basking 85-90F (29-32C)
Adult females: ambient 75-80F (23-26C), basking 80-85F (26-29C)
Ambient temperature refers to the temperature near the bottom of the cage and basking temperature refers to the hottest point accessible to your chameleon. Basking is where a chameleon absorbs heat from an external overhead source to help regulate their body temperature; it also promotes proper digestion and a healthy metabolism. Nighttime temperatures can safely drop down to 50F (10C) so a night heat source should not be used unless temperatures are lower than this. If night heat is needed a ceramic heat emitter or space heater should be used, not a light bulb, even red or black bulbs.