The timer function works great, it's really bright and puts off the perfect amount of heat. The light is just a tiny bit brighter when plugged in. I have mine set for 6 hours and use the blue and violet lights.

This planter is well worth the money. It usually takes radishes a full month to harvest outside. This is the cutest little aerogarden seed pod sized life support carrier.

Super heavy duty clamp keeps these lights exactly in place. The timer works great to and i don't have to remember to shut it off. My neighbors comment on the interesting glow they see through my window.