OK Quick Question i am growning indoors in and area of 2x3x6 i already have one 400w mh/hps with a digital ballist. I want to get some more lighting and i was wondering would it be better to get...

a) another 400w digi ballist lamp to provide a full spectrum of both mh and hps light and also a hood that has room for 2 bulbs

or
b) a 6 bulb 4 foot long t5 setup to provide side lighting

which do you think would insure a better harvest?