Update: About four weeks ago the nighttemperature dropped considerably below 10 degrees C. Not for one night but for more to come. So I moved all my plants indoors. They are now in my orchidarium. My orchidarium is 90x55x100 cm. I build it with aluminium profiles and polycarbonate doubleplates. On top of it is a fixture with two Osram Dulux L De Luxe 55W 954. In the upperpart I have two Scythe Slip Stream 120mm 1200 rpm for ventilation. During the evening and night a fan is blewing cool air from outsite in the orchidarium. I mist 3 times a day for 1 minute to water the plants and keep humidity high. It is RO water with Rain Mix fertilizer. RH is about 80% - 90%. Temperature is 10 - 20 degrees C. The whole bunch is on my attick. Looks great to mee. And for the good observer, you might see a resemblance with something a Swedish orchidgrower. Karma. She was and is a big inspiration for me.