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[dragon lady]

watts depend on size habitat... i also dont use a thermostat though,& it will diff with what the habitat is made from & number of vents as well
no more than 40w in a 2ft..... 60w-75w in a 3 ft- 4 ft depending on are,height depth
i use a 100w in my 6ft long,3fthigh...2ft deep glass habitat for my juve beardies... if the weather gets cooler i use a 150w
i dont use anything else than a spot heat light as it helps me with the variance in my tanks.