Try this one.
Grow Light Operating Cost - Greentrees Hydroponics
killerweed420 Reviewed by killerweed420 on . Lighting use cost I want to up the size of my grow. So I've been looking into using a 600W HPS. My plan is to do 6-8 plants. I haven't really looked into whether a 600w will be adequate, but that's not the reason for this thread. Has anyone looked into how much it actually costs per month to operate a 600w hps? I don't want to be popping up as a big red blinking light for anyone that would be monitoring for power usage that coincides with growing. That and I don't want to ramp up my power bill further then I Rating: 5