I'm getting a 6 foot cage by 2 1/2 feet wide and I have some people telling me to get a 5.0 UVB and others telling me 10.0. But the way I see it, Chameleons like to be up high, so why wouldn't 5.0 be fine even in a big cage since they'll be basking near the top often anyway. Wouldn't 10.0 be too much if their higher in the cage where they like to bask and stuff?