V.Pachara yellowing leaves

[2Barefeet]

Given that it's shedding bottom leaves it's probably nothing to be too concerned about. From what I can see in the pics the plant looks reasonably healthy. My vandas tend to shed more leaves this time of year, and I believe it's due mostly to the cooler and dryer conditions of winter. Some questions:

-What are the temps you are growing it in?
-Temp of the water you're using?
-How much light are you giving it?