I am surprized just how much they are stretching, (reminds me of my Mexican Sativa grow)
you are correct, the preflowers only started 10 days ago and they are nearly double as tall now
I had to lift my hood again this morning, I only have 6 inches left with this setup, so it looks like another room re-vamp coming up soon.
If it gets really bad, I can remove the planks from the bath-tub and allow the gals to sit on the bottom of the tub
As for lights....600 watts HPS is all they get. I may have to eventually keep the Jack's in the CFL/LED room (and sunshine) as space is becoming tight
I'm currently 11.5 on and 12.5 off but think of altering to 11/13....but not sure when is best to do this...your thoughts?
anyhow....don't think you will have issue with only one day of 22 hours of light...it will likely show no negative signs
cheers