What type of underwater lighting is most commonly used in pools?

Wet niche lighting is commonly used in pools because it is specifically designed to be submerged in water and can safely operate in this environment. This type of lighting is installed in a watertight fixture that is placed directly in the pool wall, allowing for effective illumination of the pool area while maintaining safety and compliance with electrical codes.

Wet niche lighting is advantageous because it is durable and designed to withstand the conditions of being submerged, which includes constant exposure to water and pool chemicals. This ensures longevity and reliability, as well as providing a uniform light distribution that enhances visibility and ambiance in the pool.

In contrast, dry niche lighting, while also a form of pool lighting, is not intended for underwater use. Fiber optic lighting provides beautiful and colorful effects but lacks the same level of brightness and illumination as traditional lighting. LED lighting, though increasingly popular for its energy efficiency and brightness, can fall into either the wet or dry category depending on the fixture, but the question asks specifically about the most commonly used type overall. Therefore, wet niche lighting is recognized as the standard choice for underwater pool lighting.