Sorry for the late reply and hope this helps -- for the money, I would opt for
http://www.fullspectrumsolutions.com...ct_68_prd1.htm I personally use three of these in my bay window to supplement daylight (which is dismal this time of year) and love the response. The plants seem to like them. Not too expensive. I made my own extension cord with Home Depot parts. Will share method if you like.
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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.)