need to know if its better to use the clay pellets or soil or the cubes for a hydro cabinet. And in vegie state room built out of a night stand how big of light only one strain of bud since the room is 3'hi 3wide 14" to 16" deep using a 400 watt ballistic in both boxes but wondeing do I need all that watt for the veg room thinking maybe 250 watt since its cheaper and I only have enough room for one strain