Possible problem with Neofinetia Falcata?

[ColoradoBirddog]

First time I've tried a vandaceous orchid, so it's new to me.

I noticed that the lowest leave has yellowed a bit, looking like it might drop off? Is this normal, kind of like phals?

Growing conditions are around 80°F, 60% humidity in a vivarium, with good airflow. Lots of light from 400W HPS.

[Shoreguy]

Totally normal unless you get a large number yellowing at same time and dropping off which could be do to excess light.