I run mine 12 on and 12 off and have good results. The LEDs can burn the leaves very easily without any heat so be careful when lowering your lights. If you lower the LED stay with the plants or check back every few minutes to watch for leaf twisting. If the leaves twist, raise the lights until you don't get twisted leaves because twisted leave will burn and hurt the plant growing shoots.
If the lights are too high from the plants then they will become leggy and have weak stems. My LEDs are 18 to 22 inch's from my plants when I use them. I have burned many plant leaves until I learned the hard way, that more light is not always in the best interest of the plants. I hope that helps
