I think direct sun after 3 pm is fine for cattleyas, vandas and even some oncidiums. They may burn a little at first or develop red spots or red borders on the leaves but eventually they will adapt to the brighter light and grow better as a result. It helps to increase the light slowly if that's possible. I have friends with cattleyas mounted on palm trees that get almost full sun except at mid-day. One other point. Orchids given strong light need to have good root systems so don't put a small orchid with a couple of roots in full sun.
Last edited by tucker85; 07-21-2013 at 10:58 AM..
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