lights

i have four 6ft plants at day 30 flowering under a 400 watt hps i want to know if this is enough light and what do u think my yeild will be
thanks guys

in my humble opinion more light is needed, if you r lucky you will get a g a watt wet.

we need pics please

grow lights only penitrates about three feet down so it your going to grow plants six feet tall your going to need side lighting down amongst the plants if you really want to harvest as much off your six footer as you would off it if was grown out side to the same size.