Well, to sum up this grow.....it was fun. These autoflowers sure gave me a surprise. They outgrew any photo plant I have grown, granted I have only had two grows before this one. I felt helpless as I was not in control of veg and flower, the lights were just 18/6 and literally, I hung on for the ride. The plants did what they wanted to do.
Really no difference in running the EC/PPM vs any other plant I have grown. Maxed out at 600ppm on the 500 scale.
The 18/6 light cycle did well to keep the grow space warm during the winter.