Spectral distribution of light in a growth chamber (GC) and in a plastic greenhouse (PG). In the PG, light spectrum was measured at full sunlight of the representativesunny day during the experimental period in the Busan area of South Korea. (A) Blue + Red LED light in GC, (B) Blue LED light in GC, (C) RED LED light in GC, (D) ambient lightin PG at noon of a sunny day, (E) Blue + Red LED light in PG, (F) Blue LED light in PG, (G) Red LED light in PG, (H) incandescent bulbs (Control) in PG.