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Bro with a 4 by 4 area using cfls it woujld take like 80 bulbs. if your working with a 4 by 4 space and want 18 plants you are gonna need like a 600 watt or a 1000 watt hps. at least imo.
i have a 4 1/2 by 5 ft by 5 ft high space and right now i have a 400 hps and a 600 hps and 4 t8 floros 4 ft each. anyway i have 6 5 gals in there and then i can fit about 20 clones on shelfs around the perimiter. if i time em right i could have the clones replace the plants as they finish flowering....
with the 6 plants in 5 gals i end up growing 6 different strains then i get about 4 to 6 oz off each. depending because dont forget there is no deffinite formula to this. its all about what works for you.
if you want to get maximum yield and all your only gonna be able to use cfls. read up on scrog and learn how to get the most out of your lights by controling the canopy and getting the lights close enough you negate the fact its only floros......good luck bro. your about to start the most satisfying hobey ever.....sorry im drinkkin