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.
This is a 200w light if, and only if you have more than one 220 plug you can use. Contacted seller 24 hours ago, awaiting response.