Yeh constant light is good to get em whizzing along but if you are growin indoors your plant will grow another 2/3s it,s size in the flowering stage so be carefull of any hight restrictions.
e.g if you have 6ft to play with then you should leave em get no bigger than about 18" or they,ll be up against your light b 4 they have finished to bud.

Disco....