| Humidity is good. Humidity above 60% can cause other problems such as rot and fungus.
Hard to say how your light is without a measurement. If the leaves get very light or start to burn, then it is too much. Make sure you monitor your watering, you may have to water more in warmer brighter conditions. I have all Phals, about 240 in my gh right now, I keep it at 900 footcandles. you will run into problems at higher than 1500fc.
How cold did it get on the window sill? 60˚F at night is as low as I usually go, some people have had success with a gradual lowering to 45˚ at night, however that will substantially slow growth. I would only suggest that or lower if you are willing to lose a couple plants. If they do get cold, keep them dry. |