The 10.0 are too strong for panthers and even veilds (imo)
There's lots of info re: these and other UV sources
please perform a forum search.
I stick with 5.0 tubes.
Not to oversimplify...
Basically most people will place the tube directly over the top of the cage
and not figure in the adjustment required if they use a reflective housing
(such as the 48' ones I use)
that will increase the total downward output.
Also the animals gauge their UV exposure by heat/light sensitivities
vs total UV absorption...
In short, more isn't always better.
a sub adult male will be fine in the 24/48" cage
anything below that will perhaps have a major problem locating enough food