and i am one of em hehehehe!
when your seeds sprout, use the floro, put as close as possible to seedlings.
i would not suggest using the big light on them until they are at least 3 to
4 weeks old, or until they have a few, at least 4 sets, of TRUE leaves.
the intensity of the big light will kill em.
it has been my experience to put only 8 to 10 hours of light to the new seedlings. i`ve read, and experienced, more females to male ratio doing this.
this is just what i do, not a set in stone thing.
18 to 24 hours of floro light is what most do.