Yeah, Vandas aren't usually among the top 10 varieties for vivariums unless they are really large. The problem with Vandas is that their root systems tend to be equal or greater in length than the actual leaf section... it's not uncommon to see 2 foot plants with 4 foot long roots... I just made an orchidarium that is 4 feet tall, and I wouldn't want it much smaller.
With that said, you can probably do smaller vandas if you suspend them, and soak the roots fairly often. They do like fertilizer, every time in weak doses is not too much. You could supplement the daily habit with bucket soaks in a weak fertilizer solution and probably do well.
Yes, 2000-4000 FC is ideal, they will take almost full sun, so Metal Halides or better is reccomended... or at least a big compact fluorescent spiral bulb nearby. But they are relatively forgiving, and will grow under lots of conditions. You'll know when you start if they're happy...
I would just say that you'll want to maximize your air flow, and lighting, and the space might not be a big deal.
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