| CPC A01G 7/045 (2013.01) | 9 Claims |

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1. A bimodal blue light for promoting plant growth, comprising peaks in wavebands of 431-441 nm and 445-455 nm, respectively, wherein a ratio of a number of photons in the waveband of 445-455 nm to a number of photons in the waveband of 431-441 nm is 1.18-1.54.
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