I answerd Sam by private message as well, but few orchids would need more than 6 weeks of 11 hour days to start the reproductive blooming process. A number of orchid types don't even need short days to bloom, so it depends on what you grow. Similarly, a cool down associated with short days (a full vernalization) is only needed for certain types or orchids, but with my mixed collection in a single indoor growing room, I have to give the vernalization to every plant, whether they need it or not.
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