Very nice plants! Congrats. About harvesting, the earlier you do it the more THC content you will have. Once the pistils start turning brownish is probably the best time to harvest, and smoking the bud will result in a cerebral high. As the pistils start to turn brown the THC starts to convert to other chemicals that give you a stupid, fuzzy high. The more pistils that turn brown, the more THC is converted. I would probably go with 75-25 white to brown ratio. The snow white is an autoflowering strain??? What light temperature are you using for your CFLs?