The HPS-400 Droplight is a high performance underwater utility light developed for nuclear refueling tasks.

Featuring a 400 watt high pressure sodium lamp, the HPS-400 Droplight provides 50,000 lumens light output and lasts an average of ten times longer than conventional incandescent lamps.

Intrinsic to the design of the HPS-400 Droplight is our patented bonding process. A flexible insulating compound is used to permanently bond the 400 watt HPS bulb to an electropolished stainless steel base, which provides shock absorption and eliminates the need for gaskets or seals.

The HPS-400 Droplight also features a protective outer quartz envelope which surrounds the bulb's sodium arc tube, providing a thermal barrier. This allows the light to go from air into water while in operation without damage. The lamp is extremely rugged with no filaments to break and for added protection an electro-polished stainless steel screen completely encloses the entire bulb assembly.

The system includes the HPS-400 Droplight, reflector, detachable power cables, and a regulating ballast power supply. With a diameter of just 1.8 inches, the droplight can be easily lowered through small openings and recovered without snagging problems. Cables are constructed of flexible IEEE-383 rated polyurethane, which contains no halogens and is easy to wipe down to minimize contamination.

An optional cable management system includes the ballast power supply and cable reel with slip rings mounted on a high-density polyethylene platform.