Feeding of early vegetative 18/6 plants & 1 600w or 2

We're on our first grow, first week of vegetative 18/6.
Started to feed every 2nd day with Ionic grow 3/4 strength.
Wanted advice earlier rather than when too late.

We also have one hps 600w light. Would two 600 hps lights quicken growth. Or what is the best lighting set up to improve plant growth ?

run on search on using nutes.

u have 2 600's for how many plants?

we have 9 plants with one 600w hps.

HPS is not the best CCT (color) for veg. You can do 9 plants with CFLs or MH. I do believe either will provide you with better results. If you decide on CFLs there are many here who can advise you on which ones and how many.