T5's are great for this. I think a double t5 will work just fine, but your light meter will be the final answer. You can't really predict ahead with distance. You should be checking light intensity with a meter. 500-1200 foot-candles is great for Phals.
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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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