are those organic? i think they should work as long as you keep an eye constantly on the ppm meter ( in the beginning ). I also have Plagron 100% Bio (dutch) for soil and i am switching to hydro. I asked the guy at my local grow shop and i was told it should be fine. The organic nuts although...
6500 is good for growing only - day white - it's closer to the effect of the sun in the summer , for flowering is good to use the lowest and warmest light - 2700 K - or warm white - it's close to the sun light in the autumn when the outside plants bloom. It's the same when you use Metal Halide...