I have my tubes on 12 hours a day from December until mid February. Then 13 hours from mid February to mid March. From mid March until early May when I move them outside I go to 14 hours.
In the Fall from mid September until late November, 13 hours a day.
I can drop my lights but I don't. I prefer to watch my orchids reaction to the lights by monitoring the color of the leaves carefully. The leaves tell me if the plant is happy or not.
