^^^^^^^^THIS.
I completely agree with Bogertophis.
I aim for about 50% average with my BP in winter and mist when she goes into shed to up the humidity. In the summer it averages closer to 60% in her tank with the same water bowl.
There is a lot of debate on proper humidity for BP's. Too little can cause issues shedding and with RI's, etc. However, too much can cause issues as well. 50-60% seems like a good range and will give you flexibility.
Upping a little to help and ensure a good shed is never a bad idea, but if humidity is over 65%, probably not necessary.
Further, I have a range in my tanks as well because of where the water bowls are and the hot side tends to dry things out a little more.
Know that many humidity gauges aren't perfect and that's another reason I shoot for a range, and not a specific number.