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David, Do you know the type(s) of orchid you bought ?
Did you plant them in the shade? They need dappled sunlight-as they would get growing in the branches of a trees canopy.If the leaves went light green-yellow, (or black) this is why they died. Orchids are not happy at temperatures over 30 degreesC, while this alone will not kill them, a combination of too much light and heat probably will.

I have no idea of the types other than I think they were purple. I just know that we bought them at some place that was an elephant and crocodile show (not together!) that had a large area selling flowers.

Yes the were planted under a kind of 'canopy' made out of wood and palm leaves that is Jakarpong and Ubonwans 'Flower House'. As for the temperature - it was February...

David