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I had my incubator set at about 76F but I think I would go a couple of degrees cooler next time.
Breeding season is in the fall (Oct., Nov.) and the eggs are laid about 4 months later. Incubation is about 4 months too.
The females are often stubborn/fussy about laying the eggs.
I kept the cages in the mid to high 70's in the winter and the high 70's to low 80's in the summer.
Here's a site with some information...
http://www.adcham.com/html/taxonomy/species/chderemensis.html
Do you have a gravid female?
I had a double fluorescent fixture above each cage (at the back, on the lid)....one UVB light in it and one regular fluorescent.
I have never bothered to candle chameleon eggs...so I can't help you with that.
Its not usually hard to tell if they are fertile once you have a little experience. Infertile ones have a different look to them (slightly more yellow and not as "solid" looking), are usually slightly smaller than fertile ones and will usually mold, shrivel, etc. in a couple of weeks after being laid. Fertile eggs will be quite white and "solid" looking when laid.
Straying from chameleons for a bit...I haven't bred beardies, but I have kept males and they lived good long lives. I've kept malis and water dragons too (and a multitude of other reptiles). I have a mali right now that is missing half of one lower back leg and the foot on the other back leg. It was a birth defect from improper incubation. At the age of 6 months it was no bigger than a one month old. I was given it by the person who hatched it to see how it would do...its feisty and after about 5 years with me it has finally reached about 75% of the normal size of a mali!
Thats cool. Same thing with one of my Beardies. It wouldn't grow until one day I came home and he was 2 inches bigger!!
I never used one since I had the two fluorescents (one UVB and one normal)on the cage and that made the temperatures within the right range. You need to do whatever it takes to get the temperature in the right range.
when they are sexually mature?
Man, Thats not too good.