niko,
In Choco-Cube, i have a 70w HQI (metal halide)6000ºK spot and 2x36w 6000ºK PLL. It´s a DIY ligthing hood, which I name "Enterprise", like "Star Treck" space-ship.
Raul-7,
Not only dilute with sand, with red clay (like laterite), vermiculite and blond peat too.
Greetings from Spain