Older pbulb. That's all. It is losing it's ability to photosynthesize due to age and is becoming a storage vessel. When you water it throroughly, feel how heavy it is. Now let it dry thoroughly and feel how heavy it isn't. That's when you need to water it. Kodama CD like to be kept on the dry side until it starts pushing new buds. Not completely dry. Just on the dry side. Good light levels and when you feed it, feed it weakly weekly. Cut your normal fertilizer in half. My KCD is doing quite nicely with temps during day in low 60's and night temps in the 40's. Not much water at all. Once a week or even less. Cold temps and water don't go together especially with this orchid. Keep it warm if possible with good light.
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