I've had good results with coconut husk in the past. I've switched to hydroton now but that's because I grow outdoors in Florida and it's often too wet for coconut husks. I know one grower down here that has good success with a combination of coconut husk chips and hydroton. My oncidiums and some of my smaller cattleyas grew very well in coconut husk. Probably the only drawback is that it's hard to remove from the roots when you repot, but that's not really a big deal. I don't know about LED lights. It's interesting that your plants are growing well. I'm not sure LED has been out long enough for people to have much experience with it. It would be interesting to research the light spectrum and intensity of LED. Keep us informed about how it works for you. Good luck.
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