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The company pointed out that it is necessary to cover a seamless transparent cover around the light source, otherwise the flying insects can easily invade the light source, causing electrical failure, and even failing to set up for half a year.
It is reported that the ultraviolet rays with a wavelength of 340-350 nm are attracted to the flying insects, but the light of the above-mentioned wavelength is not detected in the light-emitting spectrum of the white LEDs equipped with the LED street lamps, and the reason for attracting flying insects is still under investigation.
In addition, the company pointed out that the LED lamp also has the problem of the weight of the heat-dissipating material, the connection method of the LED bulb and the power source, the understanding of the luminous efficiency and the light beam, the use of a weak current for lighting, and the inability to use the fluorescent switch. 
A Japanese company refers to LED lights are easy to recruit flying insects, the specific reasons are still under investigation
[High-tech LED News] Recently, the Japanese street lamp manufacturing company said that LED lights are easy to attract flying insects. The company believes that the higher the color temperature, the brighter the light emitted by LEDs, and the easier it is for flying insects to gather.