ok heres how my closet is set up

-------- _____<---attic entrance(attic is only 3.5 ft at highest point)
| |__|____/<---shelfs that run above the stairs leading to 2nd floor
| |__|___/<----plants
| |____/
| |<---doorway
^those up and down lines are makeshift carboard walls i made

i can take the lid off to the attic and drop my light from there but im still afraid its not going to be tall enough. Is there anyway to control your plant height?