This type of orchid does not grow in the ground but in the top of forest trees so that it gets as much sunlight as possible. Not too hot so east or north facing window, soak the roots once a week and allow the water to drain off.

One of the orchid growers on here told me to look at the colour of the roots, including the ones that stick up out of the pot. If they are white you can water it but as Bulba says make sure you let it drain afterwards. If they are pale green it doesn't need any. Have to say yours looks pretty healthy - just take the brown buds off, the rest look great.