Keep bugs at bay in two different ways. Yellow light is less attractive to flying insects, keeping bugs from swarming around your outdoor gathering when you turn on the lights. Place them under patio awnings and exterior wall lanterns to enjoy the outdoors without attracting mosquitos and other annoying insects. LED bulbs with bug zappers attract insects and zap them on contact. Place them indoors to keep unwanted pest populations down when they sneak through open doors and windows.