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Hey guys ive seen heard people mentioning "PPM". i was wondering what it it means and stands for, for what i've heard, i believe it some mechanism that can measure nutrient level of some sort. Please explain (:

Hey guys. I bought some hps and mh bulbs, screwed them into the socket and plugged it in. It didnt work. I tried googling and all i see is that i need something called a ballast? can somebody explain to me how to operate my hps and mh bulbs?

:leaf::leaf::leaf: Hey guys. This is my hydroponically grown mary jane grow log. Seeds: Bubblegum, Masterkush and two heavy indica bagseeds. Setup: 23 Watt Cfl x3 46 Watt Cfl x1 10 Gallon tote tub Double chambered fish pump 2x2x1.5 Rockwool Nutrients: Foxfarm GrowBig Foxfarm BigBloom...