UVB distance

Hey guys I have a question- what is the best distance from bulb to chameleon . I have a 48" 5.0 reptisun -? My terranium is 3' wide x 20"front to back x 5' tall , any feed back would b great !
 
For me, it depends on the size of the chameleon but I always provide branches at varying heights, so they could be 5" from the light or 12", it's up to them. What I'm a little more careful with it the distance under the basking light but under the UVB I have branches at all heights.
 
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