Though I was hoping for slower growth, i am not sure it was that much slower than 18-6. I gotta say, I am actually pretty happy with 12-1 as far as the growth I got while waiting to move into the MH. I certainly wouldn't want to cycle my HID that much, but for LED it worked fine and the plants seem fine, thrived even.
1-2 weeks in the MH, we will see the difference, or course this is 400W vs what ever that cheapy 90w LED UFO puts out. Not sure how big I can let these go since they will be sharing what I usually put only 1 plant into.