Not sure who swords was talking to, but I should have listed my conditions. I have the minimum temp set to about 72 degrees. It was a little cooler say 67 degrees before i boosted the setting. It gets warmer during the day, but not much warmer during the cold days of winter. Although when the Santa Ana winds blow it gets into the 80s.
Last summer minimum temp was 70 degrees. Daytime can get into the 90s, but usually only a high into the mid 80s. I need to check humidity, but it was on the dry side, (40% - 70%), before I added a humidifier. My system is pretty low tech. Just a Wal-mart oil-filled radiator with a tray of water on top.
I supplement the natural light with 4 40 watt fluorescent tubes. Summer time they get some direct filtered sun light, but no direct sunlight in winter.
I currently grow bical, gracilis, insigins, northiana, rafflesiana, reinwardtiana, truncata and veitchii with no problems. The amp gets the least amount of light.