Will begin my 4x4 attic grow at the end of January. Looking to use 4x4 tent and 900 watt led mars 2, maybe 4 T5s in the corners of the tent to help supplement spectrum. Have seen good things about the mars2 light on BigIrishDoodes grow journal and Icemuds grow journal. I still deciding on soil or the possibility of hydro grow. I intend to battle the frigid outdoor temps by using a heater with a digital thermometer for auto shutoff. I live in a very 420 friendly neighborhood but I will still be using a carbon scrubber with in line fan for smell. Still have some deciding to do on exactly what to use and how to go about it so any advice will be greatly appreciated.