Cattleyas like a lot more light than do phals, and can generally take a bit cooler conditions (not that they need them, it's more a case that phals prefer it warmer). However, a lck of light is not likely to be the culprit, based upon the blackening leaves.
As the leaves are dying, and this is not the case of bacterial rot that occurs in the rhizome and pseudobulbs, I recommend that you unpot that puppy and check the root system. If it is in a state that cannot support the vegetation, leaves may drop, leaving the p-bulbs as storage vessels for the remaining growths.
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