I on the other hand, shocked my plants cuz i transplanted them the night i switched to 12/12 and the flowers took a bit longer to show, so i do try to keep that in mind when 'harvest week' looks like its beginning to approach.
you would be wrong. im in the middle of flowering right now with 6500k bulbs (acutally 6700k, 6bulb T5HO setup). cant afford the HPS for the denser buds til later, but it will very much work, just not quite as well. if its a usable spectrum of light, its usable throughout. some just work a lil better