Best advice I can give that probably helped me the most was finally breaking down and buying a PAR meter. They aren't cheap, but dialing in very specific light intensities fixed the catastrophe that was my first grow. I also learned not to trust the manufacturers PPFD chart after that. Also to save money get the Photone app, it uses your phones camera to approximate the PAR output of your light. It actually isn't too far off from my PAR meter. Getting your PAR settings dialed in for sure will be huge.
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