Most of the lighting in houses and commercial facilities has replaced to white LED lighting. Therefore, creatures such as moths attracted to fluorescent light and mercury lamp in the past are no longer less attracted. However, Parasteatoda tepidariorum are flocking to white LED lighting and nesting. We expected that the factor is Parasteatoda tepidariorum shows positive phototaxis to the wavelength contained in the white LED lighting. We investigated the phototaxis by the attraction experiment and the visibility by the electroretinogram (ERG) signal measurement. As a result of the investigation, we got the characteristics of Parasteatoda tepidariorum that high visibility and high attraction rate of the wavelength contained in the white LED. Therefore, we conclude that Parasteatoda tepidariorum will flock to the LED lighting devices because of positive phototaxis to the light of white LED.
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