That's funny, Charlie. An aging Baldans K was my first thought, too.
Spiregrain, here's what I would do: put your phal in the same window where you have your onc, but about 1 foot further away from the window than the other orchids are. At one foot away, it is getting half the light the onc is.
Feel the leaves while the sun is shining in the window. If the sun is too bright for it, the leaves will feel warm. If they are warm, move it another 6 inches away. If cool, you can move it a few inches closer to the window.
Repeat and repeat til you have it where it seems to get maximum light while the leaves stay cool. That way you don't risk burning it, but you are giving it the best light you can.
My guess would be your phal will do fine with the other two orchids, or just a few inches further away.
My mistake when I first started with orchids was to interpret "bright shade" as shade. They are talking about greenhouses, where bright shade is very nice light indeed.