Verical is a great idea as long as you don't need to get to your window. If your Phals love the amount of light you have, I wouldn't move them; Miltonia and Paphs would probably do well with the same amount of light. Oncidium, Dendrobium, Cattleya and Brassia usually like moderate light in an E, cool W or filtered south window. I have my Oncidium, Dendrobium, Mtdm. and Brassia in the first row by my S/W facing sliding door, with my Phals and Paphs, behind them. Then my Cymbidium and Zygo are in a different room with a southern exposure with filtered PM sun. That seems to work well for me. I'm not sure what other kind of other chids you have, but I hope this helps. Keep in mind that these are general guidelines and there are exceptions to every rule--then there are hybrids such as my Mtdm. which is a Miltonia X Oncidium. Bottom line is if it works for you and your chids then all is well. You can always experiment until you have the right balance for your chids. Additional artificial light is also an option.
