Lights or Solatubes
New here, and had a question about lighting, it seems to be the greatest expense. What is your opinion on installing a couple of solatubes in the room directly above the area where I want to start growing? According to the web site, the 21" is the equivalent to 60% of a 400 watt Metal Halide light. I primarily want to do this in the winter, my other concern is the length of the day. Thanks for your time.