hmmm IMO those are made for small tanks and terrariums with frogs in them.Ive looked at them and well wasnt impressed.
If you are looking for a misting system for a greenhouse or a patio you might want to check out Aeromist . Home page - Patio Misting Systems, Mist Fans, Fog Systems: Aero Mist Outdoor Mist Systems, Outdoor Misting Kit
Just an option for you as I really dont know what you need or are looking for or how much you want to spend.
What you want to spend is going to give you a better idea of what you need
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