Meowschwitz, I'm not really sure (I keep my indoor Tillandsia in low humidity set-ups). Problems can arise with keeping Tillandsia in high humidity conditions: the plants don't dry out as quickly after becoming wet (a much better possibility of rot and respiration problems). I'm not saying it cannot be done
(never say never), especially within an enclosure that provides good air circulation. I've been told that some species can handle higher humidity better than others (e.g., T. Butzii, T. Cyanea, T. Flabellata, T. Bulbosa, T. Branchycaulos, T. Velutina). I have learned it is 'good' for Tillandsia to have a chance of drying after watering.
T. branchycaulos, 2 different forms (maybe a good candidate with high humidity)
T. bulbosa, 2 different forms (another possible high humidity candidate)
Thanks, tippeecanoe. Their blooms are really enjoyable to view, and most are very vivid. The only drawback is most blooms are very short lived. The 'plus-side' is that most Tillandsia reproduce fairly easy after blooming (via off-sets and/or seed). This allows another cycle of blooming from the pups-offsets, and/or seedlings... which has the potential to keep the cycle going on and on. My personal fascination with Tillandsia comes from the diverse textures/shapes of the plants (along with the different shades of greens, silvers and whites), but even better: the ease of care (and maintenance) for the plants.