Wondering why this happens???

I forgot to add my grow tent is 2x4x5
And how do my fellow growers save on electricity, I currently running 2 galaxy hydro 300 watts LEDs with a 4 in inline fan with a adjustment meter and a 6 in hurracane 2 speed fan
Lately my electricity bill as been going up 50 to70 bucks than before, the only different thing I did was add the second led from my last run and my bill never went that high the most maybe 30$
 
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