The 4421C is a static white, wet niche swimming pool light designed to enhance underwater environments with clean, vibrant illumination. Using advanced LED innovations and energy-saving technology, it brings breathtaking color temperatures to pool settings while maintaining reliable, long-term performance. Built around COB (chip on board) LED technology, the 4421C delivers static white light in five available color temperatures—2700 K, 3000 K, 3500 K, 4000 K, and 5000 K—ensuring design flexibility for both warm and cool lighting preferences. Light output ranges from 4500 to 5300 lumens depending on the selected CCT, all with a CRI of 70 and a fixture wattage of 54 watts. Rated for wet locations and fully submersible, it is engineered specifically for underwater applications and is cCSAus listed to UL-676 and UL-8750 standards.
The fixture incorporates in-line dimming capability through a Forward Phase protocol, offering an IDIM in-line dimming option that allows smooth control down to dark. Its wide flood distribution (NEMA 7x7) provides broad, even coverage across the pool floor and walls, supported by a precision optical system that includes a heat-resistant tempered glass lens featuring a 30° spread and 15° downward deflection. This optical design ensures effective light placement while maintaining clarity and durability under submerged conditions. The 4421C also features a temperature-sensing low water cut-off as a standard safety measure to protect the fixture during abnormal operating conditions.
Constructed for durability, the fixture housing and door are made from heavy-wall cast bronze, offering strong corrosion resistance in aquatic environments. The companion niche is built of stainless steel and equipped with a cast bronze mounting ring that provides positive locking for secure fixture placement, along with four mounting ears for tying to forms or structural rods. The internal and external surfaces include pressure grounding lugs for added safety. The gasket is a single-piece molded U-shaped silicone component that ensures a reliable seal. Each unit undergoes factory leak testing at 10 PSI (0.70 kg/cm²) while fully submerged to verify integrity before installation.
Installation is streamlined, as the 4421C can be mounted inside an existing 4421 incandescent niche, and it comes standard with a minimum of 35 feet of #16-3 ST submersible-rated cord. The cord entrance uses a brass water-tight seal and is epoxy encapsulated to maintain long-term protection. Voltage is rated at 120V, and the fixture is finished in bronze to complement pool surroundings. The product qualifies under the Buy American Act (BAA), DOT Buy America regulations, and the Build America, Buy America Act (BABA), meeting requirements for domestic manufacturing and procurement.
https://hydrel.acuitybrands.com/products/detail/1784170/hydrel/4421c-led-swm/wet-niche-led-underwater-swimming-pool-fixture-static-white
