How much do Grow Lights cost to run?

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Been checking out feminized seeds as my present garden, one strain had 8 of 9 turn out to be male. First time in over 9 years of indoor growing that has happened.

That happened to me last year and one was a Herm and got to 3 of my plants out of 8 and I found it pretty quick. This year I went to a well known seed store all fems and if you germinate them per their instructions, they are guaranteed to or they will replace them.
 
I'm running an HLG 550 V2 Rspec, this draws 480 watts...........If its cool enough in my tent interior I add the Timber 2 VL for another 200 watts during mid to late flower......We have NOT noticed much of a spike in the utility bill at all. $25 or less extra a month.
 

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