Do you mean Phaleonopsis? They are happy with lower light, east windows are usually good. If they are struggling though, I would look to their roots and how they are potted. Perhaps you can post pictures of them and more details on the direction the windows face, whether or not they are shaded and what temperatures you have in your house. Also, are they still in the pots they came in? What media is used in those pots and do they drain well? Phals need good air to their roots as well as moisture. They tend to rot easily.