Signify 321505 Metal Halide Lamp 1000W BT37 E39 Mogul

Product Description

The SIGNIFY 321505 is a 1000-watt quartz metal halide lamp designed for high-intensity discharge (HID) lighting systems. Operating at 263 volts AC and drawing 4.1 amps, it delivers 71500 mean lumens with a 4000K cool white color temperature and a CRI of 65. The BT37 blown tubular envelope houses an E39 mogul single contact base, making it a standard form factor for commercial and industrial HID fixtures. Licensed electricians and lighting contractors install this lamp in enclosed fixture applications using a compatible M47/E ballast with switch-start ignition. Its rated average life of 10000 hours suits installations where relamping frequency is a cost and labor concern.

This lamp is suited for commercial interior and industrial applications including warehouses, manufacturing floors, gymnasiums, and large retail spaces where high lumen output and long service intervals are required. The clear envelope and cool white output support environments where color neutrality and broad illumination coverage are priorities. It is compatible with enclosed fixtures and requires an M47/E ballast rated for switch-start operation. The 6-pack designation indicates it is available in case quantities, which is practical for commercial relamping projects.

Key Features

• 1000-watt output delivering 71500 mean lumens for high-intensity commercial applications
• BT37 blown tubular envelope with E39 mogul single contact base
• 263 VAC operating voltage at 4.1 amps
• 4000K cool white color temperature with 65 CRI
• 10000-hour average rated lamp life for extended service intervals
• Switch-start ignition compatible with M47/E ballast, enclosed fixture required

Compatibility

Designed for use with M47/E ballast systems in enclosed HID fixtures requiring a 1000-watt BT37 metal halide lamp with an E39 mogul single contact base and switch-start ignition.

Installation Notes

Installation should be performed by a licensed electrician in accordance with NEC requirements for HID luminaires. Always de-energize and allow the fixture to fully cool before handling or relamping, as operating temperatures are extremely high. Verify ballast compatibility with the M47/E designation and confirm the fixture is rated for enclosed lamp operation before installing. Do not operate this lamp in open or non-enclosed fixtures.

Technical Specifications

• Wattage: 1000 W
• Voltage Rating: 263 VAC
• Amperage Rating: 4.1 A
• Mean Lumens: 71500
• Color Temperature: 4000 K
• Color Rendering Index (CRI): 65
• Lamp Type: BT37 Blown Tubular
• Base Type: E39 Mogul Single Contact
• Average Rated Life: 10000 hours
• Ballast Type: M47/E Switch Start
• Fixture Requirement: Enclosed
• Lamp Diameter: 4.6 inches
• Lamp Length: 11.5 inches

Standard Information

• Brand: SIGNIFY
• Manufacturer Part Number: 321505