Lastly, You have to have light to grow indoors. Years ago I grew with flouros, then I went to HPS and MH, then I tried t5's and nowadays I do LED. From an efficiency standpoint, LEDs are hard to beat. I can't afford top of the line like Fluence or Spydr and I don't have the ceiling height for spectrum king or a similar fixture. I have the budget for good quality Chinese imports so that is what I will use. Back in the HPS days a good rule of thumb was 40 to 60 watts of light for each square ft. of growing area. So I'm sure someone will jump in here and argue but in MY opinion, when it comes to second tier grow lights, meaning the good stuff coming out of china, that 40 to 60 watt per square ft. rule is still one I try to live by and it has served me well. There is a catch though. Those guys don't know how to tell the truth about their lights so you have to look a little harder. Look at the wall watts and by that I mean the actual amount of power consumed by the light. For example, in my case I chose VIPARSPECTRA lights and more specifically the 900 watt model. I purchased 4 of them, and am using 3 in the flower area and 1 in the veg. tent. This model draws 405 watts from the wall. My actual grow footprint is 4 ft. by 8 ft. and that equals 32 sq. ft. These lights give me 37.5 watts per sq. and that is working very well so far. Since they are switchable between veg and bloom, running one in veg only gives the optimum light for vegging and at 300 watts of output is ideal for that enclosed tent, which is a total of 8 square ft. and with this particular light at that setting is providing 38 watts of light per sq. ft. right in the low end of the range and ideal for tender young plants. So far I have the light hung from the top of the tent and I am seeing no stretch and no signs of stress. In the flower area I have the lights mounted on rope yo-yo's so they can be adjusted.