EFFECTS OF LED LIGHTING COLORS AND ILLUMINANCE ON THE NOCTURNAL ACTIVITY OF HYNOBIUS TOKYOENSIS

Abstract

 In this study, experiments were conducted to clarify the effects of colors and illuminance of LED lighting on the nocturnal activity of a rareand nocturnal species of Hynobius tokyoensis. White, blue, green, yellow, and red LEDs were used in the experiment, and the activity of this species under 1 lux and 10 lux illuminance was compared with that of the species when the lights were off.

 In the 1 lux experiment, the activity of this species was 32 % under white light, 42 % under blue light, 44 % under green light, 64 % under yellow light, and 35 % under red light, compared with the case when the lights were off. The results suggest that the magnitude of the suppressive effect on activity of H.tokyoensis at the same illuminance is white ≈ red > green ≈ blue > yellow. In the 10 lux experiment, many individuals were inactive regardless of lighting color, with activity ranging from 0 % to 29 % compared to when the lights were off. Thus, the nocturnal activity of this species was suppressed at higher illuminance, regardless of the color of the light.