The expansion of human activity into natural habitats often results in the introduction of arti cial light at night, which can disrupt local ecosystems. Recent advances in LED technology have enabled spectral tuning of arti cial light sources, which could in theory limit their impact on vulnerable taxa. To date, however, experimental comparisons of ecologically friendly candidate colors have mostly considered only one type of behavioral impact, often on only single species. Resulting recommendations cannot be broadly implemented if their consequences for other local taxa are unknown. Working at a popular re y ecotourism site, we exposed the insect community to arti cial illumination of three colors (blue, amber, red) and measured ight-to-light behavior as well as the courtship ash behavior of male Photinus carolinus re ies. Fire y courtship activity was greatest under blue and red lights, while the most ying insects were attracted to blue and amber lights. Thus, while impacts of spectrally tuned arti cial light varied across taxa, our results suggest that red light, rather than amber light, is least disruptive to insects overall, and thus more generally insect friendly.