I believe this orchid is from the Phalaenopsis species. I took this shot by setting it outside (bright day, but in the shade) against a very dark background.

If you like pictures like this one, and would like to both be inspired and enhance your photographic skills, I refer you to the Orchid Works (www.orchidworks.com). They have many beautiful pictures of different orchid species as well as several pages dedicated to tips on orchid photography.