Almost all the nobile, farmeri/chrysotoxum and aggregatum type Dens need cool, bright winters to flower. Early stopping of fertilizer, as Kim mentioned, is also very important to them. Search through Orchid Board on these names and you will see how many people have this problem. People try to keep them very dry to compensate for inability to keep them cool, but that's not adequate. Many species of this type of Dendrobium get a lot of dew in winter in habitat, even if it doesn't rain.
Others that come to mind off the top of my head that bloom better with cool bright winters are some species of Brassavola, Cattleya, Chysis, Neofinetia, as well as Rhyncholaelia (Brassavola) digbyana- though the last also blooms well with a warm to hot and very bright winter.
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