Photosynthetic rate and growth rate measurements were carried out for lettuce using red laser diodes (LD) and various spectra of light emitting diodes (LED). It was found that lettuce grew healthily under red LD (650 nm) and blue LED with R/B ratio 10. However, both photosynthetic rate and growth rate rather diminished compared with LED case.
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Mori et al. (1999) studied this question.