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Assuming a grow is a 60 day flowering period. How often, on average, do you replace your HPS lamps?
How many months do you like to wait between changing out your floro lamps?
I just finished my third run with this lamp and am going to be buying a new one for my next run. I personally like to exchange lamps every 4 months (two grows) of flowering. I try my best to change out my veg lights every three months as that seems to be the point where the lamps start putting out less light and more heat.