LED lights provided to the growth chamber or to the plastic greenhouse during cultivation of strawberry plants in South Korea.
Photoperiod
Artificial light PPFD
Fig. 2. 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 representative
sunny 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 light
in 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.
Fig. 3. Daily ambient light integral measured in the plastic greenhouse during the cultivation period (September 1 of 2011–March 31 of 2012) of strawberry in the Busan area of South Korea.