OK, here's the answer
Yes!
I have happily been keeping the new tank at nearly 99% Here's the specs:
Tank not quite closed tight (approx 7 square inches openings in two 1/2" slots)
No active air exchange with outside - only passive from opening doors a couple times a week to fertilize and through the slots.
Active misting runs for 5 seconds every 4 hours. 3" 12 volt fan blows directly on orchids and front wall 24/7.
Top of tank averages 71-72 degrees F and 90-94% humidity (depends on how much time has passed since misters went off)
Bottom of tank, out of direct air movement stays approx 3 degrees F cooler (further from lights) and a constant 99% humidity.
Bottom line, new grow, new roots, new spikes, and even my Dendrobium aberrans will be blooming soon. Second species I haven't killed yet.
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Ross
http://orchids-ross.blogspot.com/
I don't do most Dendros or large, "floofy orchids". For me it's minis (like Angraecoides), Masdies, Paphs, and others that crept in somewhere along the line. See my orchid list for complete collection (usually not current.)