Most interesting seeing your postings, Pitter.
I notice that you are in Colombia so you might get accurate information from the Sociedad Colombiana de Orchquideologia
http://www.sco.org.co/ . I know many members and they are most knowledgeable. I have visited their annual magnificent show at Medellin Botanical Gardens in the first week of August. Really worth a visit and you will find so many good growers. They also have some natural rain forest which can be visited to see plants in the wild.