This doesn't come from light my friend this comes from overfeeding the plant has nutrient burn, and after reading your diary, it's more than likely from the Miracle-Gro Bloom your using, this a photoperiod plant so it's too early for bloom nutrients, she needs veg nutrients right now until you flip the light cycle. Also, Miracle-Gro isn't the best choice for nutrients when it comes to growing, tried it once noticed it wasn't cannabis-friendly, and starting using GHE products.