Some Catasetums and related genera might want more light than you can give - but maybe not. Fred Clarke at
Sunset Valley Orchids hybridizes this group of plants. Along with hybridizing big plants, he works on smaller plants for indoor growers. You might drop him a line and ask him your question. I'm sure we all would be interested in his answers, too.
Quite a few Stanhopeas fit your size description and do not need as much light as Catasetums. Go to the
Internet Orchid Species Photo Encyclopedia and
Stanhopea Culture Blogspot to read about some Stanhopeas. Most of them do send flower spike down through the medium, so they need to be grow in open baskets.