Naoki, they are probably 2/3 the size of Tamakongo's flowers.
Swamper, all mine are grown indoors under T5's so I have better control over growing conditions. I put a few of them on the windowsill in the summer. They can tolerrate a range of temps but optimal conditions seem to be cool - intermediate temps and medium - medium high light, depending on the variety.
Peewee, I got Kuro Shinjyu from Orchids Limited (orchidweb.com). Online catalog is not up to date but they just got a shipment in from Japan this week so you can call to inquire.
Craig, I don't use my humidifier anymore so my RH never gets above 50% during the day. Most days it's 40's. In the winter it's even lower. I don't let the moss mounds dry out during the growing season, only during the winter rest period.
Thanks for the nice comments, everyone