:what is the lowest/highest you can put them outdoors safely?
Rick::Most studies on the subject show benefits from as little as 20 to 45 minutes of exposure a day. I wouldn't recommend leaving them out for extended periods of time unless you’re sure that the enclosure can provide sufficient shade, water and protection. Keep in mind that the shade will change as the day progresses. Another thing to keep in mind is the size of your lizard. A smaller lizard has a greater surface to mass ratio and needs less exposure time and is more susceptible to temperature changes and extremes. The best temperatures are when you can get 70-80 in the shade. As for the min and max that depends on size of your lizard.