Hmm.. I guess my office experiment will end in a fail then. I just got a large white NOID as a gift for Admin's day a few weeks ago. I repotted her in lava rock and bark and she still has lots of flowers.
I am lucky to have a full window in the office but it is tinted and north facing. The orchid is under T8 fluorescent lights... about 4 ish feet below? I am hoping this with regular watering will help it maintain it's flowers... but I guess I will take it home after it drops the blooms. (Here's my setup:
LINK)
Most of my phals are in very bright, direct, South-facing light and have been hardened to these brighter conditions... I just did not really want ANOTHER phal... and a giant one at that. Was planning to stick to minis. Oh well!
samgeo, if this current North-facing setup is working for you and you have gotten reblooms, I say, why change it? Your orchids seem happy to give a spike and rebloom so I don't think a North window is a death sentence.