The clamp is strong and holds lights in place. The timer is very easy to set and they clamp on easily. They make your plants very happy and you don't have to have them by a window.
The clamp on the light is an added bonus. I have it hooked to a small 3 shelf set up hanging on my wall. I really like the clip-on feature; it offers more flexibility for adjusting the gooseneck dual head lights.
It definitely perks up my plants. I see my plants responding to them and growing very well.
Choose the light intensity and duration for your type of plants/seedlings/cuttings with 3 light spectra, several levels of brightness, and 3 timer settings. The timer function is my favorite. My only frustration is that the timers vary.
Picture appears to be black lamps, but they are infact silver in color. Cord is barely long enough to reach from above my aquarium to the wall outlet. The timer on this is pretty inaccurate.
This light is in a bedroom, so with it coming on earlier and earlier is a problem. It flickers and gets dim. It constantly turns off and changes brightness.