Effect of Various LED Light Qualities, Including Wide Red Spectrum-LED, on the Growth and Quality of Mini Red Romaine Lettuce (cv. Breen)

Recently, LEDs with various light qualities have been used in closed plant factories, and they are known to different effects on the growth quality of crops. Therefore, this study was conducted investigate change mini red romaine lettuce using qualities. Wide spectrum (WRS)-LEDs, blue (B)-LEDs, + (BR)-LEDs, (R)-LEDs, white (W)-LEDs were as artificial sources. Regarding growth, R-LED treatment showed most positive effect, but leaf shape not normal Hunter b* value suitable because it higher than that other treatments. The a*, SPAD, NDVI values B- BR-LED treatments effective, case for those R- W-LED anthocyanin reflectance index 1 (ARI1) 20 times B-LED treatment, ascorbic acid content highest WRS-LED treatment. In sensory evaluation, bitterness sweetness opposite tendencies. overall preference, received score. Correlation analysis closely correlated color. Taken together, BR-LEDs provided a good top fresh weight, dark leaves, high contents, preference; therefore, cultivation lettuce.