hey guys I just got another 400 watt mh for free


. currantly I have a 3x3x8 closet with 1 400 watt mh on 4 plants in a dwc system. temps are staying around 75-78 degrees .plants are only 2 1\2 - 3 weeks old. dou you guys think it would hurt if I stuck another 400 watter in there if I kept the temp about the same? and do you think it would benifit the plant any. oh and by the way it would be in a cool tube just like the other light. or would you get a mh to hps conversion bulb so I could get the best from both worlds or just wait till flower time and put it in with the hps conversion bulb? any suggestions? or is it possible that much light in that space is a waste of time energy and electricity.