Agree with Bud, except that I don't think I'd let it get down to 50°...
Maybe down to 55°, but if it were me, 60° at the coldest... Maybe I'm wrong, I'm not familiar with
Vanda coerulea, but I do know that
P. tetraspis is a "warm/hot" grower, and I'm pretty sure most
Vandas are at least "warm" growing, if not "hot"... Just my
Definitely agree with the possibility of
Cattleya light, as opposed to
Vanda light! 'cuz
Phal. tetraspis is a low light grower, so
Vanda light will probably def. be too bright!
EDIT: Where did you get this? It sounds like an interesting cross! Is it blooming sized? I would
LOVE to see the blooms on this one!!