I have 7 or 8 Vandas, 6 are seedlings bought over a year ago from R.F. Orchids. The oldest one, from 2012, has bloomed 3 times for me. The 2nd time, the flowers lasted for over 4 months....indoors.
I live in North Carolina where the humidity is high in the summer, where they are kept. Winter time it's very dry because of indoor heating. Late fall they come indoors until May. The artificial lighting is 4 4 ft. T5 fluorescent bulbs and one 150W HPS. The T5's are kept on for 12 hrs./day, the HPS about 1.5 hrs. What works for the Vandas and Oncidiums is 2 humidifiers. They're used during the day and turned down a bit at night. I also mist the roots in the AM before going to work. The humidity is usually 55-65%. If it's raining hard, I can sometimes turn them off completely.
I also have a Lou Sneary Bluebird from Chadwick and Sons. It's mounted on tree bark and bloomed 6 weeks after bringing it home. Another vanda that has adorable blue/lavender flowers.
Yes, a lot of work but they're worth it! I can't wait for Pachara Delight to get bigger and then bloom. Vandas are gorgeous in full bloom. Good luck!