Sorry I'm not of much help, I don't know much about them either. I came to read the posts. There are one type that are grouchy...or is it teugs?? lol :p
I don't know about Desert Series 50s killing chameleons because I use the tropical series 25s for my chameleon, those are the ones you are supposed to use not the desert50s. Since I am a zilla owner, I also have the desert 50s but I use them for my bearded dragon and I have never had any...