What is the height of your plants in inches? I am looking to grow small plants and I was wondering If my Max height of Box is about 2.2 feet of growing Space height I have aleready included the light in this Height. At what height should I switch the lights from 18/6 to 12/12. When the plant gets about 8-10 inches? Or even less?

Total box is 2.11 feet so CFL T5 light is 3 inches down total So I estimnate 2.2 Feet of growing height.

Any help is greatly appreciated.