I have one gal that has the hardest time growing under full spectrum white based lighting. She's a SFV OF. I can't even grow her with my no-till mix under full spectrum white based lighting because she almost turns pure yellow, and the only way to stop her from turning pure yellow is add 15ml ca/mg, and 2 tsp epsom salt to my base per gallon of water, but that causes other problems so its not good. But as soon as i put her back under HPS, the green returns in a few days, and I don't need to use any ca/mg and only 1/4 tsp of epsom salt to keep her happy using my no till mix. And I also tried it using just pro mix with perlite, using salts, for example GH trio, 6ml micro, 12ml bloom, 5ml ca/mg, 1/2 tsp epsom salt is what usally keeps my SFV OG gal happy, and it did until the 2nd week of flower, then the yellowing started, and in a single week she got almost all yellow, but as soon as i put her back under HPS, the problem completely disappeared in like 3 days!
under HLG 600 V2
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Under HPS...
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