Fig. 1. Image of culture flask with (a) red LEDs, white LEDs, and fluorescent lights
used the light source, (b) different light intensity (100, 200, and 350 lE/(m2 s), and
(c) the different photoperiod of 9 h light: 15 h dark, 12 h light: 12 h dark, and 24 h
light: 0 h dark.