The range of a marine search light can vary widely depending on its power, design, and atmospheric conditions. Generally, marine search lights have a range of several hundred meters to a few kilometers.
The range of a search light is affected by several factors, including the output power of the light, the size and shape of the reflector, the clarity of the lens, and the atmospheric conditions. In clear weather conditions, a powerful search light with a large reflector and a high-quality lens can have a range of several kilometers, while in foggy or hazy conditions, the range may be significantly reduced.
It is important to note that the effective range of a search light is also influenced by the height of the observer and the height of the object being illuminated. A search light mounted on a tall mast will have a greater range than one mounted at a lower height. Similarly, a search light aimed at a tall structure, such as a lighthouse or a bridge, will have a greater range than one aimed at a smaller vessel.