Worst case scenario...just use the 2700k lights as veg lights until it grows to right height. Use the 2700k 18/6 then just drop it down to 12/12 when you have grown the plant to sufficient height. I would advise against setting it to 12/12 from the get-go, if that is what you are talking about. The light change is what causes them to flower so you need a change...good luck.

my :twocents:

I don't even konw what a marijuana plant looks like, though, so don't take my word for it.

Be cool.

TGF