the plants will be fine for the first few weeks. after that they will of used up all the nutrients in the soil so you'll need to replace these. natural you want natural use organic nutrients. either way to get the best out of it and not waste your time using nutrients would be the best bet. as for lights i started my first grow about 3 months ago, i started with just one 125w(625W equivalent) 6400k/8000 lumens. now all the plants are well into flower and under 2 125w/2700k and 1 125w/6400k. seem's to working well.