Reducing the blue spectrum of artificial light at night minimises insect attraction in a tropical lowland forest

New infrastructure development in previously natural environments is introducing light pollution to habitats at an unprecedented rate, which has the potential to be devastating for native insect assemblages. We evaluated insect attraction to three lamp types emitting different spectra of light (white, yellow‐filtered and amber‐filtered ~3000 K LED lamps) and an unlit control in a lowland forest site in the northern Peruvian Amazon previously naïve to artificial illumination. Lamp type was the only variable included in the most parsimonious models explaining morphospecies richness and abundance for all insects combined and for eight different insect orders. White lamps (3200 K) attracted far more insects, both morphospecies and individuals, including groups containing important vectors of pathogens, bacteria or parasites, than either yellow (2700 K) or amber (2200 K) lamps. Amber lamps attracted the fewest morphospecies and individuals overall but were the most attractive for a limited group of insects, including elaterid beetles (click beetles) and mycetophilid flies (fungus flies). While period of night was not a significant predictor of morphospecies richness or abundance, different assemblages of insects were collected during two different sampling periods (18:00–20:00 and 03:00–05:00). We strongly recommend that new infrastructure development projects introducing ALAN to light‐naïve tropical forests use filtered amber LED lamps with no blue and minimal green light content in outdoor lighted areas. Similarly, operators should develop outdoor lighting plans that include overall reduction of nocturnal lighting and impact mitigation measures. These recommendations should also be used to retrofit existing infrastructure including roads and human settlements. en español El desarrollo de nuevas infraestructuras en entornos previamente naturales está introduciendo contaminación lumínica en esos hábitats a una taza sin precedentes, la cual tiene el potencial de ser particularmente devastadora para las comunidades de insectos nativos. Evaluamos la atracción de insectos a tres tipos de lámparas que emiten diferentes espectros de luz (lámparas LED blancas de ~3000K sin filtro, con un filtro amarillo y con un filtro ámbar para limitar o eliminar los espectros azules de luz emitidos) y un control sin luz en un sitio de bosque bajo en el norte de la Amazonía peruana, previamente sin iluminación artificial. El tipo de lámpara fue la única variable incluida en los mode