Fluorescent lighting might be a bit too low for cymbidiums. Mine take direct early morning sun from about 7 A.M. to noon, followed by bright indirect light for the rest of the day during the growing season. They get watered a lot too, with moderate amounts of fertilizer. I live in a climate that's hot and very humid during the summer. If your temperatures are more moderate during the summer, you can probably get away with giving them even more light. During the winter give them as much direct light as possible, let them dry out a bit between waterings and try to keep the temperatures cool, especially at night and when the plants are in spike (warm night temperatures tend to make many cymbidiums drop their buds, especially those hybrids that are derived from cooler-growing species). Don't be anxious to bring the plants inside when temperatures start to drop during the Fall. The plants need the cooler nights to initiate spikes, and I usually don't bring them inside unless the overnight temperatures are predicted to fall below 40 degrees F.
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