Yeah Bruce your Phals are fried. And not chronic frying, that would
show up as purpling...Actue frying for sure. Give those suckers less
light...Do your research quick or those plants will die.

The oncidium definatly looked a little thirsty, but it is by no means
beyond hope.
I'd yank the plant out and look at the root system, I'd be willing to
bet there's some damage down there. Try to push that plant with
significantly higher light ( ~ 2500 - 3250 lumens). While I wouldn't
recommend it, some people down in the southern US latitudes have been
known to grow this alliance outside all year. Given that you're a
beginner and still learning about your plants, I suggest using a
greenhouse so that you can control the environmental inputs more.

Good Luck