No need to do that since you already have the tubes. I only recommend a blend for esthetic reasons - the flower's true colors are more apparent with 5000K lighting. The plant doesn't care, as long as most of it's spectrum needs are met - which they will be with those tubes.
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Ross
http://orchids-ross.blogspot.com/
I don't do most Dendros or large, "floofy orchids". For me it's minis (like Angraecoides), Masdies, Paphs, and others that crept in somewhere along the line. See my orchid list for complete collection (usually not current.)
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