How many time should i keep my UV light on (reptisun T5 HO 10.0 UVB) from zoo med when I searched on google i read that it should be on for 10-12 hours but i read a thread that said it should be on for around 3 hours, and i need to know the distance since I don’t have a UVI parameter and I don’t seem to get one soon, i shall get 2 hermann tortoises (testudo hermanni) this week so i need to figure everything out, if the light should be on for 3 hours should the heat source be a heat lamp? Or is it ok for the light source to be the room light and the heat source a ceramic heat emitter?