How much to run

Alright so i changed my grow setup and i will only be doing one plant so im only going to be running 200 actual watts of cfls, 2 fans and ill be doing autoflowers so ill have it on for 20/4 and my kwh is 0.0864. Could you tell me how much for 8 weeks and 9 weeks.

Much less if you just grew photoperiod...

20*0.2 = 4kwh/d

Do the math from here. We are supposedly adults, this is children s mathematics.

That would be like adding 2 lamps with 100 watt bulbs to your living room.