Blue light mosquito traps can be effective at attracting and killing some mosquitoes, but they have limitations. Mosquitoes use light to navigate when looking for food, but they also use other cues like body heat and carbon dioxide to find prey. This means that blue light traps may only be effective for certain species of mosquitoes, or those that are less attracted to light. For example, light traps are more effective for mosquitoes that are active at night, like the Culex and Anopheles species, but less effective for daytime biters like the Aedes aegypti species.