what is the ideal number of seeds i should use for one 1000w hps mh light? my plan is to add more lights after first harvest which brings me to one more question, how much strain do these lights put on the electric bill? im not worried just want to be prepared. thx in advance.
Are you asking how many seedlings can grow under a 1000w or how many plants can you grow through to harvest?
Regarding the power bill, yes, it will boost it a fair bit. My 400W HPS on 12/12 adds about $200 to my 3-monthly bill. I fit two healthy sized plants under 400W during flowering, or three smaller ones, if that helps.