Well, i cant belive im saying this, but dopeman420 is right.

You can use them if you have nothing else for the whole grow.

People normally use CFL's/Mh's during veg because they have a bluer spectrum which is for vegative growth, HPS has a red spectrum for flowering.

And CFL's can do just a good a job as any MH, so they are not weak lighting.
LIP Reviewed by LIP on . Lighting Question Well im getting 3 free 400 watt hps lights because they were stolen and my friend can't hold any hot items in his house anymore... So i was wondering, why do people use weak lights during veg, then stronger lights during flowering?.. Is that a must?.. Can i just use a HPS for the whole grow?... Thanks.. :thumbsup: Rating: 5