We measured the bio-electric potential of maitake mushrooms under the stimuli of an incandescent lamp, a red LED (light-emitting diode), and a blue LED, each with strong and weak light intensity. Temperature and humidity were constant. As a result, it was found that the bio-electric potential of maitake changed according to the type, wave-length and intensity of the light source.
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Ogawa et al. (1997) studied this question.