Welcome to the forum Julies Liam, if you haven't already you should read through the panther chameleon care sheet this forum has put together. Hopefully it will answer any questions you may or may not have yet.
Panther Chameleon Care Sheet -...
You may like this even better -http://www.shootingonlocation.com/filmlocations/madagascar/sambava/sambava-climateguide.php
Someone may challenge me on this, but unless your chams are in a basement or windowless room, it would probably be better to have them set to your locations day/night...