This study was conducted to investigate the effect of different qualities of LED irradiation on the growth of and antioxidant concentrations and activity in Sedum takesimense. After blue LED treatment, leaf length and width increased, and there were more leaves per stem than under other treatments. The plants under RBW (red:blue:white = 1:1:1) LED treatment had significantly higher fresh and dry weights than those under other treatments. The concentrations of total flavonoids and total phenolics and DPPH (2,2 Diphenyl-1-picrylhydrazyl) radical scavenging activity of the plants increased after light treatment. The concentration of antioxidants (total flavonoids and total phenolics) and DPPH radical scavenging, ABTS [2, 2ʹ-Azinobis-(3-ethylbenzothiazoline-6-sulfonic acid)] radical scavenging were higher after blue LED treatment than after any other treatment. The concentration of total flavonoids was highly correlated with that of total phenolics (r = 0.821, p ≤ 0.05) and with DPPH radical scavenging (r = 0.505, p ≤ 0.05), ABTS radical scavenging (r = 0.767, p ≤ 0.01). The concentration of total phenolics was also strongly correlated with DPPH radical scavenging (r = 0.868, p ≤ 0.01) and ABTS radical scavenging (r = 0.862, p ≤ 0.01) activities. It is suggested that blue LED treatment affects the synthesis of antioxidants during growth in chamber. We thus conclude that these antioxidant compounds are a major factor in determining antioxidant activity. Therefore, it was determined that Sedum takesimense belonging to Crassulaceae can be grown using blue LED in growth chambers.

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