Bc. Hawaiian Wizard turning dark brown?
 

This was a division from a larger plant, about 2 months ago. The plant looks healthy and is in a moderately low light part of the green house, about 2000 fc. when there is direct sun Two weeks ago the newest leaf began to turn brown, like the change you see sometimes from too much light. Within a week the whole leaf was dark brown in color but still well hydrated and "waxy", and looked otherwise healthy. The other leaves show no evidence, to me, of light damage and where this plant is, it is hard to believe that is the cause. Any ideas?

Sunburn.

Humidity in the greenhouse kept at 50%. Temp hasn't been over 80* in the past month. It may be as you say but this is a totally new phenomenon to me. No other plant, out of about 90 orchids has shown this???

Well, it looks exactly like sunburn.

OK. I'm listening. I will move it to a shadier spot. Tnx.