i read somewhere that insect vision starts to phase out around 550nm to 650nm (yellow to red) and ends on the other end at around 300nm. i use a 365nm light as my UV source, and it does seem to attract mostly small insects. if i add a white light (which should have a mix of other wavelengths), i attract other things. i’ve been thinking about getting a 395nm light, since i read somewhere that 400nm seems to be the best wavelength for attracting a wide range of insects.