UVB lighting distance from basking

[Duenas]

Im confused of the uvb lighting distance from basking area where I believe my beardie would spend most of the time? Please help!! And I also read reviews of people saying it should be 12” and if you read in the back of this bulb it states at least 6” and then 18” so what is it? I am using the sun blaster lamp with it.

 

[xp29]

I try to have overlap with the uvb and basking so my beardies can have either/or, or both. They will move into the area they need.that bulb is a t5 so 12 to 15 inches (if unobstructed)

 

[Duenas]

I try to have overlap with the uvb and basking so my beardies can have either/or, or both. They will move into the area they need.that bulb is a t5 so 12 to 15 inches (if unobstructed)

Thank you