Those moisture detectors are handy, but honestly, they're just one piece of the puzzle. If you're comfortable getting your hands dirty, I'd suggest do...

This makes total sense to me. Humidity trays always struck me as more of a placebo than anything else—maybe helpful for tiny plants or seedlings, but ...

Totally agree on LEDs being the smarter choice here. Had a basement flood myself a couple years back, and the fluorescents I had down there were toast...