not sure but i just picked up some cfl at the local hardware store on sale for 2.99 each . i am not use them to grow but i suppose you could . I actually have one over a coffee can dwc setup just for kicks in my computer room to see if it will sprout up and take off . the cfl can be had at 5700 ish which is a more blue light then soft whites . All this info is worth only what you paid for it as i am super noob when it comes to growing anything . i think the soft whites have more of a 2500 red light to them ?