Encyclia polybulbon question

[pdxmaven]

I posted this on the "beginniners forum but didn't get a response, so figured this might be the better place."

I got this plant from an orchid guy who is leaving town.
Actually, it is a mass of plants, maybe 100, all growing on/into a piece of old door mat, which in turn in held in a wooden frame . The whole thing is about about 12 " x 12" and the roots are either on top of the doormat or growing into it.
I noticed when I got it that some of the leaves were yellow. And that has continued to be the case, with the yellow leaves now dying. I assume it is too much light or too little light?

also, how much water does it like (with the way it's mounted) and what sorts of temperature?