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One of my buddies just went from his dual ceramic lights to HLG leds. He made his own brackets and custom setup for a 10 x 8 room. He had some extras parts he didnt use and sold to me. So now I have 2 quantum 288 boards and I would like to build a light for my 4x4 tent. I usually only grow...

I am getting ready to setup some HLG lights in my 4x8 tent. Been vegging now for a few weeks and would like to get the LED's setup before I flip to flower. Are there any big differences in the way I feed or grow my plants going from HPS to LED? Someone mentioned possibly using cal/mag? I...