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I will move it back to the east window then, at least it will get more sun. Thanks for the diagnoses!
HW
Also if it is possible consider getting one of the higher wattage Compact Flourescent bulbs (I like the 55 watt) such as http://www.fullspectrumsolutions.com...ct_68_prd1.htm I just made an extension cord with a plastic light socket on the end and hung the bulb near the orchids. They put out high amounts of light with little cost.
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.)
I don't grow Oncidiums but concur with what has already been said...light, light and more light. They do need quite a bit and a north window just isn't enough. It does look healthy though...you'll have blooms in no time flat and we expect pictures.