the present invention relates to an environmentally friendly beacon or light for illuminating a pole - mounted flag , banner , pennant or the like that has a luminous source located in a laterally extending cover , is mounted on top of the pole , and is capable of continuously directing an umbrella shaped illumination toward the flag , banner , pennant or the like as the wind blows the same to rotate about the flagpole . the flagpole light of the present invention is designed to be installed as a retrofit in existing flagpoles having a shaft supported knob or sphere located a short distance above a rotatable cap .