it wasn't meant to be a test, as to some questions i would like to work together on and get to the buttom of but okay. that light situation really depends on temp and if the light is cooled go with no less than 30 cm cause if thats a new bulb . that will be givin you anywhere from 3500 to 5500 lumens and i know that sounds low but that in verse square law kills the intensity any more than 55 cm you might as well be doing cfl whispy buds no good. i would do as close as possible with feeling good about it meaning your hands don't burn the leafs wont but about 10 to 14 inches, and i would have to say theres room to play with heat with sativas so strain matters as well the final flush is to really get those salts breaken down so you have a well balanced ...everythings pretty much having to do with the uptake. Personal opinion , if you have alot of light and you feel good about it start no later than 6 days before but no sooner than 12. some people look at it as though its a luxury but you really want to get that done, or else all your here is "well whys it sparkling then". then again with if your able to get a clearing solution you can do up to 4 and even three days be fore harvest. apply just as you would the nutrients solution with wand perferably and 10 percent run off or more is ideal.if ur using a hydroponic system change the water after the first four to six says of application assuming your def which you should be, using a clearing solution. the stems snapping thing is up in the air and that my friend is a fact, some say the buds will take in the nutrients left in the stem and taste harsh if left on that long so i understand the process and that does play in but only for the first 5 days or so then the rest is all just degradation of chemicals and what not down to the best smelling and tasting buds. some say it (the snapping) tis the only true way to proof i am on the fence still give me a day and i will give you my final statement on that. thanks get at me