Am I causing my plant unneeded stress with this lightning pattern?

[0fenderbender]

I wouldnt say you started early, but you are definitely going to want to lengthen the amount of light hours to at least 18 on, 6 off. You may need supplemental lighting. Try getting 3 CFL's and using those for your remaining day hours, You can go to Lowes and pick up a 3 Bulb Vanity Light for 9.98: Attachment 283602 you will also need these bulbs for $7.98: Attachment 283603

Hope this helps a little!!

And this should be done despite me wanting a relatively low yield in the end?