These are very popular orchids and can be readily found. One other requirement is that many orchids must have a marked difference in temperature between night and day in the fall to induce flowering. If you have a sunroom, porch or the like, it will make it easier to accomplish this task. I recommend purchasing a reference book on orchids which contains specific cultural practices for each orchid that you're interested in growing. One last area that needs to be addressed is feeding your orchids.
Some orchids can be heavy feeders.
Always research your plant's specific needs for optimal health. Two 40 watt fluorescent tubes, one cool and one warm, will do nicely. The light source should be at least 6 inches away to avoid burning the plants. Leaving them on 12-14 hours per day will provide the appropriate amount of light. Paphiopedilum, Miltonia and certain Oncidium are suitable for this method.