1st timer with 16 0z solo cups and some questions

Hey i have 20 cups in a closet currently only 5 have sprouted 2 almost 3 weeks in now my questions are about the lights i have and a few others
I have a 850 lumen cfl hanging above them with 2 longer type fluros but i picked them up at walmart the package read under cabinet grow light for better vegatation and growth and the other is the same thing just smaller but they are on each side of the plants and are close enough to them now basically would like to know if anyone else has seen or used these lights im just trying to save on the electric while keeping them nice and healthy

the soil im using is a natural soil with no chemicals figured might as well so i know what goes into it right but one has the first set of leaves almost completely wilted because of magnesium i believe il recheck that but i treated it with some schultz plant food the rest that sprouted are doing okay i think they only about 4 in high max though would that be because of the cups as a pot