A confession: For at least 20 years I've grown many of my orchids under lights, always using fluorescents and now using T5s. I grow mostly Phals and lower-light plants. I have utterly no idea, to this day, what I'm doing and it's working like a charm. My lights hang on cords with these cool adjusters. However, I don't know anything about the light output of the lamps, the average plant distance from the lamps, or just about anything else technical about my setup. I simply put the plants under the lamps where they look good to my eye's judgement, and watch them do wonderful things.
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Optimist 
Gthumbz89 
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