As I said, I tried variation, but ended up with a 13 hour day year round.
For heat I only had the metal halides, hangng approx 1 ft above ground level.
At the basking aspots I measured temps up to 130 F. Coolest temps at daytime were in the 70s range.
At night temps dropped down to themid 60s.
There was no significant environmental chnage in our house in winter.
For incubation it is essential to keep humidity close to 100% for the first two months. Than humidity should be reduced till the substrate is almost dry at the end of month 3. If eggs begin to show indentations its too dry, but minor indentations do not harm and if some drps of water are added in the vicinity of the eggs, eggs recover quickly.
However, its not easy to find the best way of reducing humidity.
I either opened incubation boxes slighly for some time or just changed bedding after 3 months.
I had best results with daytime incubation temps in the low 80s and a night drop down to the mid 60s.

Hope that helps

Ingo

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