The light only allows for minimal height adjustment. Bad light. Not much output.
The timer is great! The timer has 3 settings. After you turn it on everyday you then select how long you want it to stay on. These lights are super bright for 20w.
I normally use a t5 * setup they are so picky. They're light weight enough that i was able to mount them on the underside of a shelf i already owned. The greenhouse is metal frame with lightweight wire shelving.