Don't make it more complicated than it needs to be. I use to worry about the same thing with the lights and trying to mimic mother nature. Truth is that 18/6 or 24/0 are really the best, if your electric bill don't matter to you go with 24/0 and you'll get the best results. It does'nt sound like it is right but it is. The shock won't hurt your plants at all as long as harden them off before transplanting them into the ground.:thumbsup: