Ok, just spent a few trying to find an answer for ya. From what everywhere I went says, you don't HAVE to switch, but, as it is a MMJ plant regardless if it is auto or photo, yes, this does benefit the growth of the buds. Also, a lot of people use both but I didn't see where this is as beneficial as using just 2700k, as there is little to no vegetative growth during flowering. I'm a new grower and this is my first grow, I'm hoping someone with more experience will chime in shortly as confirm/deny or explain better. Hope it goes well!!!