Some Phal-type Dendrobiums lose a few leaves every time you change their lighting, some are less picky. I had one that lost a few leaves when I moved it outside for the summer and a few more when I moved it back in for the winter, every year. It was something I accepted and, as it put out new growth every spring and bloomed most of the year, I did not worry about this.
They do like to be kept warm all year but they do not mind a little cooler night temperatures as long as it is above 50'F. They prefer to stay above 60'F, though and have warmer day temperatures.
I like red lava rock and an over-sized basket pot for these so that they do not need re-potted. Once they are established in the pot, many of them will be in bloom much of the year.
They should be just fine under the T5HO bulbs. I have just one right now and it spent the last cold season under the lights and was very happy. They prefer the same light as Cattleyas.
These like to be watered very well but to have plenty of air around the roots. You can satisfy this if the medium dries very quickly (even in the middle and bottom of the pot). That is why they are often sold in very small pots. Years ago, it was often recommended to mount them but the red lava rock/basket pot serves the same purpose by providing plenty of air to the roots.
You have a very beautiful Dendrobium there! Good luck with it!
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