Think of flowering a cannabis plant as lighting a bottle rocket, you light it, it only flies so far up, the same can be said about a plant, a soon as bloom starts you only have so much time before it's done. By using perlite in your medium the plant gets more oxygen, you feed more because it dries out faster, and that's good during bloom because you literally only get so much time, a finite amount of feedings and only meeting the law of minimum will decrease yields by up to 80% depending on genetics. C02, the Emerson effect, perlite aka aerated mediums all serve the function of allowing you to fill the plants belly full of food instead of just curbing its appetite. The Emerson effect is essentially water evaporation off the leaves, it's how a plant drinks and pees pretty much. HID lamps throw tons of energy into the thermal spectrum increasing the Emerson effect, where as LEDs don't illicit that effect very well unless they have thermal cobs
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