Starting to flower with areogarden..

hey, i have some 2 juicy fruit clones goin in my aerogarden pro 200 mylard out with a 40w sun bulb from walmart, and a 17w red and blue spectrum tube light for a reef, they been goin for about 4-5 weeks, they are like 18-19 inchs tall and i just started them on a 12/12 timer, using foxfarms 3 pack, ive had a air stone going in there when i got the foxfarms nutes, have never really tested ph because i dont have ph up or down.. am i going to be able to keep the hood on or can i top the plants and try to stop them from growing taller? they are on the last extension of the hood, and they are about 3 inchs away, 1 day into flowering...
also a buddy of mine is dealing with some stuff so he let me have his 2 600w HPS and a 1000w hps all with ballast and everything. i really want to use a 600w on somthing. can u use 600w on aerogarden for flowering? or what other systems can i use for the 600w, i can get really bomb clones, so if anyone knows any good setups for 600w, or a 1000w hps,
any info at all would be great guys, please give me some tips and ill keep you all updated and pics,

Well you got a bunch of issues going on. The aerogarden is to small really for growing ganja but if you do you wanna flower real small plants and preferably from clones. A rooted clone you want to go 12/12 no more then 6 inches tall max and thats gonna push it as the aerogardens res is way to small for 1 good plants roots more then 1 is even more trouble. At 19 inches if its sativa it will be 5 fett tall when done and if its indica probably 3 feet tall.You top efore going to 12.You do it when they are smal so you stop upward growth and get 2 main colas then veg them til the 2 new colas get established.In aeroponics you have to ph and check your ppm daily if you dont know those you might as well just grow ina bucket and set it outside and let mother nature do whatever as the ph and ppm will control the whole grow. You will have to rip that light off the setup as its in the way and way to small.The bigger lights are great but for this setup its a basic total waste of time for these plants as Ive seen one grow that was actually something to weight. Your looking at maybe a quarter sac of middies dry with this setup...sorry Im not an asshole just a realist.