Lumark MHSS-M-400-MT-U HID 400W Hanging Warehouse Light Fixture 120-277V

Lumark MHSS-M-400-MT-U HID 400W Hanging Warehouse Light Fixture 120-277V

The Lumark MHSS-M-400-MT-U is a 400-watt HID pendant-mount high bay fixture built for industrial and commercial warehouse environments. Made by Cooper Industries under the Lumark brand, it houses an integrated multi-tap ballast that accepts 120V, 208V, 240V, or 277V supply wiring, making it adaptable to a wide range of commercial electrical systems. The fixture includes an aluminum reflector designed to direct light downward for wide-area illumination. No bulb is included.

Specifications & What's Included

• Model: MHSS-M-400-MT-U
• Brand: Lumark / Cooper Industries / Cooper Lighting
• Wattage: 400W
• Lamp Type: HID (Metal Halide compatible — MH-N-5A lamp type per label)
• Ballast: Multi-tap, integrated into upper housing
• Primary Voltage: 120V, 208V, 240V, 277V (multi-tap)
• Frequency: 60 Hz
• Ballast Capacitor: Challenger Circle F Inc., 4-KV Pulse Rated
• Mounting: Pendant / hanging mount with swivel hook
• Reflector: Ribbed spun-aluminum cone
• Safety Chain: Present and attached
• UL Listed: Yes — HID Fixture Issue No. 17,044
• Style No.: 62011750
• Manufacture Year: 1989
• Manufactured by: Cooper Lighting / Vicksburg, MS
• Bulb: Not included

Applications

HID high bay fixtures like the Lumark MHSS-M-400-MT-U are standard equipment in warehouses, distribution centers, manufacturing floors, gymnasiums, and large retail spaces where high ceilings and broad illumination coverage are required. The 400W HID output is well suited to mounting heights of roughly 15 to 40 feet, providing the wide-throw light distribution typical of industrial pendant fixtures. The multi-tap ballast makes this fixture compatible with both 120V residential-style circuits and the 208V or 277V branch circuits common in commercial and industrial electrical panels, reducing installation complexity. Lumark was a well-established Cooper Industries lighting brand producing heavy-duty industrial fixtures from the mid-20th century through the 2000s; this unit dates from 1989 and represents the durable, ballast-integrated pendant design that was the workhorse of American warehouse lighting before the widespread adoption of LED high bays. These fixtures remain in active use in legacy installations and are sought for replacement, retrofit, or repurposing projects.