This ruggedly designed low voltage underwater fixture is constructed of injection-molded, fiber-reinforced composite for strength and high UV stability and is warranted for ten years against corrosion. A silicone o-ring gasket is fitted to the housing to ensure a superior water-tight seal. A prismatic, high impact, polycarbonate lens safeguards the lamp and optics and includes a removable mirror-finish reflector to block vertical light providing a wider horizontal spread.