交通、船舰、机场等应用领域的信号灯、探照灯容易受到天气因素的影响，本文通过实验比较了不同颜色LED光源在淡水雾和海雾中的穿透性能，并研究了淡水雾中LED光源的透光性与距离的关系.结果显示：各种颜色LED光源在雾中的透射率随距离呈指数关系下降；而且，淡水雾和海水雾中，黄光LED的透过率均为最大.本研究工作为信号灯、探照灯等功能照明提供了设计依据.

Signal lights, navigation lights and searchlights used in transportation, ships, airport and other applications are vulnerable to be influenced by weather factors. The penetration properties of different color LED light sources in water fog and sea fog were compared by a series of experiments, and the relationship between the transmittance T of LED light sources and distance in water fog was researched. Experimental results show that the transmittance T of all kinds of color LEDs declines exponentially with the increasing of transmission distance in fog; both in water fog and sea fog, the yellow LED has the maximum transmittance compared to other color LED sources. This research work will provide a basis for the design of signal lights, searchlights and other functional illuminating fields.