I'm really not sure if Phals produce chlorophyll in their roots, Chris, but they do turn green, don't they. Then again Vanda roots also turn green when you water them but turn back to white as they dry out, so I don't think they photosynthesize much.
Some orchids do, and some don't. Let's hope someone else knows if Phals do or not.
@Ursula?
@shadytrake
That being said, I don't have a valid basis for comparison because all of my Phals have at least some of their roots up waving around in the light anyway. They just do that.
