“…These factors are affected by the environment (e.g., light intensity, photoperiod, temperature, CO2 concentration, humidity, and wind velocity) and the genetic potential of each cultivar. In our previous studies, we explored the development of a supplementary lighting technique, i.e., selection of an effective light source (Hidaka et al, 2013) and determination of the optimum photoperiod for supplemental lighting (Hidaka et al, 2014b). Furthermore, we compared the effect of supplemental lighting among cultivars and observed a remarkable increase in yield in the June-bearing cultivar 'Benihoppe' .…”