Slider, Because you get the smoke faster, the air comes up from the water instead of a little hole half way up the unit. And chokes leave a filthy little circle of resin opposite the choke.
Ya for those four plants you'll probably need at least 1 43 watt a piece at the beginning (6500k), I used 4 43w's, 4 26w's, 1 46w and 2 24" T8 Warm white's on 1 female, She's bushier than a dutch pussy though
Fuck HPS you can flower with what you have.Why waste the money.You'll get a little denser buds but thats about it.The nicest looking bud I've ever seen was flowered under CFL's
Depends.They double or triple in size.Myself I'd wait til it bushed out a little more .But you can start flowering from first sprout. so If you gotta you can