Needing help i have a VIVOSUN 4x4x80 room lights 200 watts at 45% I thought it was light burn so I turned lights down and problem did not get better got worse I believe the problem to be my pH in my soil as I’m running Coco 5 gallon pots I just did a flush three days ago ph in run off 630 lights on 18 hour cycle
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For starters, you will need all of that 200 watts and more. Shoot for 50 watts per square foot and you will have plenty. For a 4x4, that’s 800 watts. You don’t have to have that much but it helps. What is your watering schedule, nutes, PH, PPM ? All the info you can provide will help diagnose your issue. At first glance, it appears you have some nute burn due to your lights not allowing them to fully use the nutes. Grow info will help. If your runoff was 630, is that ppm or was it 6.30 ph? If that’s ph, your starting lock out in coco, it should be 5.8-6.2 .
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What’s your feeding frequency with the coco medium.? Make sure to empty those catch pans of the run off before the plant wicks the expelled salts back in 
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I apologize for the lack of info so yes, my runoff pH was 6.30 i’ve been aiming for a pH of 5.8 to 6.00 last feeding nutrients in the range 5 to 600 ppm watering watering is not really on a schedule there’s days I have to water more than others
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I believe there are your issues. I’m not sure what scale your meter is measuring but your ppm is low either way. And you really need to feed coco daily, especially with mature plants. If you struggle due to life or whatever coco may not best option for you without automation. Something like promix hp is a little more forgiving and still has pretty good growth rates.
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