Actually, it's more closely related to Dendrobiums. I wouldn't have made that connection if I hadn't done a little research when I got it.
Also, the temp in my tank has stayed around 76F daytime, so not that warm. The picture is from an odd angle, so there are probably some optical tricks working on the thermometer.
The flowers are relatively large. The tallest pbulb and leaf is about 24cm (~10.5 inches). This is a division from a very large specimen plant, probably about the same height, though it had mounded up a bit, and easily 1.5-2 ft across. Not that one would have to let it get that large. It probably had over a hundred pbulbs! When that bloomed it was truly spectacular! For a few hours at least.