2024 Volume 80 Issue 1 Article ID: 22-00331
When civil engineering work is performed in a rich natural environment surrounded by forests and streams, there is a strong need to protect the surrounding environment. In particular, when nighttime construction lighting is used, it affects not only the construction area but also a wide surrounding area, so countermeasures are taken by reducing the exposure area and using light sources with low insect attractiveness. An example of a light source with low insect attractiveness is LED lamps, which emit almost no ultraviolet light. On the other hand, some species of insects are known to be attracted even by LED lights in large numbers, and further researches are required to clarify the characteristics of these insects. In this paper, we conducted insect attraction tests using LEDs of various wavelengths and flicking cycles for a wide range of insect species in near a civil engineering sites. In addition, we conducted tests to compare the insect attraction of ordinary white LEDs and LEDs that blink at 100 Hz and have various color temperatures, with the aim of applying these LEDs to actual work sites. The results showed that both wavelength and flicking cycle had different effects on different insect order. In the comparison of wavelengths, the three-color RGB LEDs tended to attract fewer insects to the color containing more red wavelengths in most orders, while single-chip LEDs with the blue LED and yellow phosphor did not attract fewer insects even when the color temperature was lowered, depending on the test site and season. In the comparison of flicking cycle, the total number of insects captured with 5 to 475 Hz decreased as the frequency of flicking decreased, while a comparison of pulsed lighting at 100 Hz and constant current lighting showed an increase in some species with pulsed lighting.
