Easy to install and online on/off switch is handy. Grip is firm and they seem well made for the price compared to higher priced ones. If one isn't bright enough, you can just buy another and daisy chain them together.

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.