SC-166 TriLight is an Auxiliary Lighting System to supplement the standard lighting of the SC-166, consisting of three military-grade dive lights custom manufactured to withstand 1,300 feet (396.2 m) of submergence.  Three easily accessible AA batteries power four high-intensity Nichia LEDs in each light for up to 20 hours of light.  These lights are mounted to the camera via an adjustable stainless steel collar and set screws that allow the user to utilize the TriLight as a forward view light or a supplemental side light.   Depending on water clarity, the TriLight expands the viewing range of the camera to accommodate well diameters of 14 to 20 inches (35.6 to 50.8 cm).