Your viv looks really nice!
if you're worried about humidity, moving the water dish to the cool side of the tank will help.
And a second light with even a regular bulb should be fine!
I have my big guy in a 40 gallon breeder and I've found that, in addition to the dome fixture with a basking bulb in it, a second dome with a regular 40W incandescent bulb adds a bit of light
and raises the temp on his cool side by a few degrees so they're in the recommended range. Which is good since it's getting pretty cold here too lol