LONG fibered sphagnum moss, NOT peat moss.
Severely wrinkled bulbs will plump up a bit with moisture but they will never be perfect. There is no need for them to be perfect.
Phalaenopsis need no direct sunlight, Oncidiums enjoy more light, on average maybe two hours a day.
Coconut coir is very stiff fibered. I am dubious whether or not it will hold enough water.
To have perfectly firm, smooth psuedobulbs means nothing. Just cosmetics!! If you grow them well, the bilbs will get as big as tennis balls in many cases. They will produce multiple spikes per bulb. AND when that happens, will it really matter that the bulbs are slightly wrinkled!!! Of course not!!!
Glad to help.
