...yes it does have a very nice spike and you have a southern window that should supply excellent light,and there are phals that are naturally darker leaved and get a red tint in higher light, so it is possible there is the correct amount of light. I like the red tint actually, and I get some red tinting under fluorescent lights
Do you know the cross of the plant and the media it is growing in?

Jimboboorchid is a phal breeder, I'm sure he knows it all....