It's late,my eyes are starting to blur so I will be brief.No Chameleon I know of ever needs or should have any light at night. If I am mistaken someone will correct me soon I'm sure!!! You should start by reading one of the care sheets available on this forum. Most chams need a good 12 hours of light and 12 hours of total darkness. Temperature should drop at night and varies depending on what type of Cham you have. All the information you need is here for you and we all will be happy to help in any way we can! Sorry I am not giving you more details now as I have to get up in about 5 hours so off to bed. I am sure by tomorrow you will be flooded with more and better information then I have provided. There are many links to answer your questions and then everyone will pick up the slack as needed. Welcome to the forum and we love pictures. If you can provide more information about your Cham,type,cage,temps,lighting,heat,humidity etc I am sure you will get many helpful responses.