After two different grows, one in soil and one in water, I am seeing the same problems with my plants that I believe are the result of using CFL lights - even though they are the correct color spectrum (2700k) for flowering. When the plants get a few weeks into flowering, the leaves show signs of nute deficiency (yellowing, brown spots, inordinant amount of dying leaves, weak bud growth, etc.) even when I have adequate nutes available and the correct PH. When I see my friend's plants who uses the same nutes, dosage, and room temperature, his plants don't have these problems. His plants also yield much better in less time. Here is the reason that I have concluded: I am using eight of the 55-watt CFL 2700K bulbs for flowering, and it is not evaporating enough water through the plant for it to be able to draw the water and nutes up into the plant. My friend who uses HPS has the same amount of plants (4) that I have. His plants go through two gallons of water a day. It takes my plants a week or longer to go through that much water! His house also reeks much stronger than mine does, and we are growing the same strains. I attribute that to his lights drawing more water through the plant and evaporating it into the house. Bottom line is, his single 400-watt HPS lamp is evaporating 10 times as much water through his plants than my eight 55-watt CFL lamps are. It goes without saying that along with that water, the nutes are going to be sucked up into the plant also. That points to inadequate lighting, right? A good comparison would be that he is lighting his plants with one sun and I am lighting my plants with eight moons. Any thoughts?