Two 18 watt soft white CFL on each plant.
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As a general rule, I believe with autos, your "real" race is to day 21. Most autos will start flowering at around that time. The goal should be to have the plant as large as you can by that point. I love cfl and fluoros for vegging autos. I use alot of them. During veg, you want to keep about a 2:1 ratio of high kelvin to low kelvin. So for every 2 - 6500K, you want 1 - 2700K. This should be reversed approximately 2 weeks after seeing the first white hairs. These are some pics of my CFL and Fluoro "tunnel".