light issue

i have 2 plants in a cabinet ( 1.5x 2 ft )and i have a computer fan cooling it . i have 2 150 watt hps lights in it right now and im wondering if i take 1 away(hps light ) will i still have a somewhat ok yeild?

not big on hps lights,i use enviro but i would think unless u have great ventilation in such a small space 2 lights may b 2 much,how does it feel wiyh 2,hot? i think a rough guide under good conditions is a g per watt of light used. best of luck man.