One of the absolute best investments I have made in this hobby is a couple of Kill A Watt meters. Being able to monitor power consumption has really made my pump and lighting choices much easier. More efficient pumps, getting rid of the closed loop, ditching the chiller for properly placed fans and most of all, LED lighting with no fans versus MH and VHO saved me $60-$75 a month year round on power bills.
probably a wise investment.

