The lights can be plugged into a timer if desired. I have upto 4 units daisy chained and once setup seems to work without problem.

Full spectrum grow lights are just wonderful! It seems to work farily well and my sunroom full of plants are doing well. They are pretty spendy, but they work great for my indoor plants and starting seeds. My orchids bloom and grow like crazy.

The adhesive strips lasted about 30 minutes before the glue gave up and the lights fell from their adhered position. Received new and two of four power cords do not work after verifying by troubleshooting with known good parts.