^^^Rhizome is more an expert on tweaking the method than I anyway. I wouldn't try to fiddle with the light cycle unless you have a compelling reason to hurry your crop up, and that reason is more important than your yield. One reason I could think of off the top of my head is a giant tropical sativa that you need to finish in a reasonable time, before the soil in the pot goes sour, and the plant is already rootbound in in a 10 gal tub in week 8 of a 14 week cycle, and transplanting into a 20 gallon pot and THEN to a 50 gallon drum simply isn't an option! lol!!!

Edit: If your plant is that big and slow, you have other worries anyway!