Fig. 1. Cultivation of strawberry plants with separate illumination of different LED lights in a growth chamber (GC, A) and in a plastic greenhouse (PG, B) that had beenoperated in the Busan area of South Korea. In the PG, natural sunlight was used inside by opening curtains during daytime and LED light was provided daily from 17:00 to23:00 with curtains closed overnight to keep warm inside. (1) Blue + Red LED, (2) Blue LED, (3) Red LED, (4) incandescent bulbs (Control of the experiment in the PG).