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I think you can switch them pretty much when you feel like it. Take in consideration that they will double in size over the flowering period. Finally, the more veg time, the more yield.

Ok man, go take a look at the sticky on the CFL (https://www.rollitup.org/cfl-growing/107992-tutorial-growing-cfls.html) This is gonna give you a REAL good Idea on how to go with those. I'm not sure full spectrum is the way to go... look for something that goes in the far red for flowering.