5. Conclusion
Light quality effects on lettuce growth are related to growth
stage, FLR promoted the seedling growth and shortened the breeding cycle of lettuce while FLB played a more significant role in
promoting lettuce growth during the maturity period. FL mixed
with R or B LED resulted in improved morphology, greater biomass
and pigments content of lettuce than monochromic R, B, FL or RB.
The mixed light sources of fluorescent lamps and red or blue LED
were beneficial for cultivations of ‘Green Oak Leaf’ lettuce.