Finding out the cause or causes of issues with leaves etc will require enough information about the plant's environment - temperature (not just ambient temperature, but temperature of leaves, roots, media etc too) ----- humidity, air-movement, fertilising schedule, mag-cal schedule, media used, watering schedule, watering method, how long the orchid has been growing in that spot for etc.
Spider mites are indeed devastating on phals and lots of other orchids. Got to really watch out for them.
As for lighting levels ----- definitely that is where leaf temperature is a consideration. The light energy heats the leaves (the cells etc) and the heat can create issues with the health of the orchid if the levels are too much, or too much for too long.
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Hybrid Mode
