Correct me if I am wrong but I think that LED for achieving HPS strength also consumpt high wattage only he is not producing so much heat like HPS.
I am using HPS 600W and with fans my monthly eletricity bills are 15$ higher.
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That additional $15 a month is far lower than what I thought.
I don't know your eletricity prices, my Kw costs 0.18 $