Plants don't want the same light at every stage. A seedling needs different cues than a flowering plant or a ripening fruit. Most horticultural LEDs ignore this and run one static spectrum from day one to harvest.
Photophil's protocol switches three times. Vegetative runs white light with 730 and 850 nm. Flowering adds 660 nm to drive fruit set, with IR stepping up. Ripening pushes IR further, layering in 940, 1,200, and 1,720 nm to drive cell expansion and Brix accumulation.














