OGgrowsanswered grow question 5 years ago this has several factors. depends on the size of the grow, for hps 600w it must be at least 1Mx1M and it must have cooltube and a high power extractor, so you will also have to have a larger filter and you will also have more heat in the grow. you will pay more than the electricity bill, so there are many more expenses.HPS is always better in terms of speed of growth and final production but a 250w led preferably with IR and UV lights the results are very close to a 600W HPS and you don't have a third of the problems