All I can tell you is what I've done and how its worked.
I have a "homemade" incubator...consists of a human heating pad with 3 heat settings on it. There is a frame of 2" x 2" wood pieces built to fit over it. That it screened in. I sit the shoe-box sized containers of eggs resting on slightly moist vermiculite on top of the screen and raise the frame until the temperature in the containers is at about 74F. I put the whole setup in the basement where I rarely have the lights on and there are no windows in the room.
For veileds, I have had almost 100% hatch rate of fertile eggs and I've hatched water dragons, turtles/tortoises, several species of geckos and chameleons, coneheads, etc. using this set up.