From Phrag culture page, linked above
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Phrags are very forgiving of extreme temperatures. They generally are intermediate growers, ideally 55 to 68 F at night and 10 to 25 degrees warmer in the day. They will tolerate nights down into the mid 40's and daytime temperatures into the low 100's. Protect the plants from direct sun during the heat of the day if temperatures are above 95 F. There should be enough air movement at all times that the leaves are moving a little in the breeze. This will be enough to keep the leaves from cooking in the sun. I do know a Vanda grower who raises Phrag. besseae hybrids under his Vanda hybrids. His night temps never drop below 70 F. His coolers do not kick on until 95 F. He has a number of fans going at all times in the greenhouse. He gets good growth and blooming. Because he has good light, the color of his flowers is intense.
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AOS doesn't have a Phrag culture sheet - kind of proves these are orphans. They do have a page that says 1000-1400 foot candles for Phrags, which is pretty low light! Lots of people say Catt. light for phrags; the phrag culture page above says more than Catt, less than Vanda light for Phrags. Hmmm....
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