Wintering and dormancy with S-H/LECA culture

[daddydoall]

Wondering how others have handled orchids that traditionally require a winter rest (dendrobium) or dry period and handle colder weather (sub 50F). It seems a constantly damp media even LECA could be a problem with orchid varieties needing a dry period or dormancy and even cause rot in others if temperatures in the green-house stay cool for prolonged periods. I just started using LECA, in normal or open pots and will use trays as a reservoir when it warms up but am afraid of plastic reservoir pots, though I suppose one simply could empty the reservoir and not water till spring?? I live in N California and grow in a green-house. Falls Temps are 50-70f, winter 40-60f. I use bottom heat when air temps drop below 40 (this makes roots grow like crazy).