meiracyllium trinasutum - leaf dropping

[Zach Valois]

meiracyllium trinasutum - cork mounted in a glass orchidarium with 6500k compact fluorescents. Was doing great for months and months, and with the onset of winter, has began to yellow and drop leaves. Perhaps it is too humid. Been letting it dry out significantly, to no avail.

Any advise?

Also, what is the systematic position of this plant and natural distribution and habitat?

Thanks,

Zach