barneys farm auto sweet tooth

hey guys just a bit of advice please. i have just planted 3 auto sweet tooth from barneys farm. i have a nice grow room with 400w hps. my problem is i can only have the lights on for 14hrs a day, will i still get a good yeild ?

thanks people

They are auto so the more light the better. You should make a journal, I want to see how they turn out.

yes i will be making a journal so keep an eye out, thanks man