CFL's are doing just great. As long as you use full spectrum light of at least 5600K you will get rapid growth. In principle the K value doens't matter too much if you look at the emission spectra charts. Its just that lower K values give higher emission peaks at the red wavelenghts. If you go for full spectrum bulbs you will get the light you need to get your plants growing.
In fact, I did some crazy experiments on plants like putting them under normal light bulbs or just UV blacklights and growing was also achieved. Nothing beats full spectrum though.
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