This research investigates the effects of dynamic adjustment of blue and red light on lettuce (Lactuca sativa, cv. Danstar) plants. Four light treatments were tested, each maintaining a total photosynthetic photon flux density (PPFD) of 200 mmol m-2 s -1 under a 16-hour photoperiod: (1) RB3 (control, 150 mmol m-2 s -1 red and 50 mmol m-2 s-1 blue); (2) 25% blue (B) reduction with hourly alternation between control and 175 mmol m-2 s -1 red/25 mmol m-2 s -1 blue; (3) 38% B reduction with hourly cycling through RB3, 162/38, 175/25, and 188/12 mmol m-2 s -1 of red/blue light; and (4) 50% B reduction with hourly alternation between control and 200 mmol m-2 s-1 monochromatic red. Agronomical, physiological, and morphological data were collected weekly from 7, 14, and 21 days after transplanting.
