Fig 1. Environmental conditions in a sunlight-type plant factory.

Environmental conditions in Matsuyama, Japan, on January 6^th–8^th, 2014. Measured values were recorded from instruments installed in the plant factory. Temperature was calculated as the average of two measurements. Temperature (black line), relative humidity (black broken line), solar radiation (gray bar), and precipitation (light gray bar) are presented in 10-minute intervals. The arrows show experimental periods, and daily measurements were recorded between 14:00 and 14:00.