Lumishore’s SUPRA-series flagship thru-hull underwater light. The THX1604 is a 2-lights-in-1 dual-color (blue plus white) fixture rated at 20,000 fixture lumens (45,000 raw) through a 110-degree ultra-wide beam. HICOB LED array (48 x 10W white + 108 x 3W blue), external driver, 50,000-hour rated life, three-year warranty. The right pick for owners who want pool-effect underwater illumination on yachts where the visual impact matters most.
The SUPRA THX1604 is Lumishore’s highest-output thru-hull underwater light, sold as a single fixture with the matched external driver. It’s the part of an underwater lighting installation that owners spec when they want the swimming-pool effect at scale: 20,000 fixture lumens through a 110-degree ultra-wide beam puts down enough light to illuminate an entire transom-line area for a typical 60-to-100+ foot yacht, with the kind of intensity that visibly shows in even relatively dark anchorages.
The 2-lights-in-1 architecture is the SUPRA THX1604’s defining feature. Most underwater lights are either single-color (typically blue or white) or RGB color-changing. The THX1604 is dual-color: a white array (48 LEDs at 10W each) and a blue array (108 LEDs at 3W each) housed in the same fixture, controllable independently. The result is two distinct underwater lighting effects from one fixture. White mode delivers the classic spotlight-on-water look that’s good for boat-side swimming visibility and security. Blue mode delivers the pool-effect, aesthetics-first underwater glow that owners associate with big-yacht entertaining.
Lumishore’s controls let you do more than just switch colors. The lights can fade between blue and white, adjust brightness independently for each color, and strobe at two speeds. Operator control surfaces include the SUPRA I-Connect Hub and switch (the dedicated Lumishore controller), or directly from a compatible multifunction display, or from the Lumishore EOS-LUX-SUPRA dedicated display, with the SUPRA Bridge module added. The SUPRA Bridge also adds Wi-Fi control from a phone or other connected device, either through the compatible MFD or through a local Wi-Fi network.
The HICOB (High-Intensity Chip-On-Board) array is the LED architecture that produces the extreme lumen-per-fixture output. Where conventional underwater lights use discrete LED packages with individual lenses, HICOB packs multiple LED dies onto a single substrate with a shared optical system. The result is higher total flux at a smaller package size, less optical loss, and better thermal management because the driver electronics live external to the fixture rather than inside it.
External-driver architecture (THX series, vs the TIX series with internal drivers) is the install-side trade-off. With the driver mounted separately inside the boat, the fixture itself is smaller, lighter, and has lower thermal load underwater. The trade-off is that service of the driver requires access to the internal mounting location, which is the typical install in larger yachts where dedicated electrical compartments exist anyway.
The flush-fit thru-hull mount is sized for transom, side-hull, or bottom-hull installation with a low profile that doesn’t affect hull hydrodynamics at speed. The 1-inch standard fitting interfaces cleanly with most aftermarket thru-hull mounting kits and matches Lumishore’s mounting hardware kits for clean installation in fiberglass, composite, or steel hulls.
Beam angle is 110 degrees, which is the ultra-wide configuration that spreads the 20,000 fixture lumens over the maximum possible footprint. For a 60-100 ft yacht with two THX1604s mounted on the transom, the overlapping beams cover essentially the entire stern area with no dark spots. For larger boats, additional fixtures along the side hull extend the lit area further forward.
The LED life is rated at 50,000 hours, which translates to many years of normal seasonal use. Lumishore covers the fixture and driver under a three-year limited warranty against defects in materials and workmanship.
Power supply and current draw are matched between fixture and external driver. The driver is sized to accept boat house-bank DC supply, with output regulated to drive the HICOB array at rated current. Cabling between driver and fixture follows Lumishore’s standard install pattern, typically a sealed multi-conductor cable run through the hull alongside the fixture mounting.
What’s in the box: the THX1604 fixture with its 110-degree optic, the matched external driver module, the through-hull mounting hardware, the gasket and seal kit, the fixture-to-driver cable, and the documentation pack. The SUPRA I-Connect Hub and switch, the SUPRA Bridge module (for MFD or Wi-Fi control), and the EOS-LUX-SUPRA dedicated display are all sold separately as needed.
