Sylvania 64507 MS320/PS-BU-HOR

The Sylvania 64507 MS320/PS-BU-HOR is a 320W pulse-start metal halide (PSMH) Metalarc lamp engineered for demanding commercial and industrial high-bay, outdoor area, parking lot, and security lighting applications. Delivering 4300K cool white output at 65 CRI with a 20,000-hour rated service life, this lamp utilizes an E39 mogul screw base, ANSI M154/E and M132/E dual code compatibility, and a base-up or horizontal approved burn position — with enclosed fixture requirement and 4,000V pulse-rated socket mandates for correct installation.

ADL Supply Expert Application & Replacement Guide

The Sylvania MS320/PS-BU-HOR (Order Code 64507) is primarily specified by electrical contractors and facility engineers for high-bay warehouse fixtures, outdoor area lights, parking lot luminaires, retail canopy fixtures, and industrial security lighting where a 320W pulse-start metal halide source is the installed platform and the E39 mogul base is the socket standard. The burn position encoded in the lamp designation — BU (Base Up) and HOR (Horizontal) — means this lamp is approved for base-up vertical and horizontal mounting orientations only; base-down (BD) vertical installation is not permitted and will cause arc tube stress and premature failure. The dual ANSI M154/E and M132/E codes indicate compatibility with ballasts carrying either designation — both are 320W pulse-start metal halide codes — but probe-start metal halide ballasts are not compatible and must not be substituted. The "/E" suffix on both ANSI codes indicates the ballast must be thermally protected (enclosed-type). The 4,000V pulse-rated socket requirement means standard HID sockets without pulse ignitor voltage ratings must be replaced with pulse-rated sockets before installing this lamp on a pulse-start ballast.

Before You Order

Detailed Product Specifications

• Brand: Sylvania (Ledvance)
• Product Line Series: Metalarc Pulse-Start Metal Halide (PSMH)
• Manufacturer Part Number: MS320/PS-BU-HOR
• Sylvania Order Code: 64507
• UPC Barcode: 046135645075
• ANSI Code: M154/E and M132/E (Thermally Protected Enclosed Ballast)
• Core Technology: Pulse-Start Metal Halide (PSMH) — probe-start not compatible
• Ballast Requirement: Pulse-start HID ballast rated for ANSI M154/E or M132/E at 320W
• Socket Requirement: 4,000V pulse-rated mogul socket
• Wattage: 320W
• Color Temperature (CCT): 4300K Cool White
• Color Rendering Index (CRI): 65
• Base Type Configuration: E39 Mogul Screw
• Maximum Overall Length (MOL): 11.5 inches (292.1mm)
• Bulb Diameter: 4.6 inches (116.8mm)
• Rated Average Lifespan: 20,000 Hours
• Burn Position: Base Up (BU) and Horizontal (HOR) — base-down not approved
• Fixture Requirement: Enclosed Fixtures Only
• Mercury Content: Contains mercury — recycle per applicable regulations

Operation, Safety & Mounting Compliance

Pulse-Start Requirement, Burn Position & 4kV Socket

Pulse-start metal halide lamps use a higher ignition voltage generated by an internal pulse ignitor in the ballast to strike the arc without probe-start electrode assistance. This provides faster warm-up, better lumen maintenance over lamp life, and longer rated life than probe-start designs — but it absolutely requires a ballast rated for pulse-start operation. Probe-start ballasts lack the ignition pulse and will fail to ignite the lamp or cause rapid arc tube degradation. The "/E" suffix on the ANSI M154/E and M132/E codes requires the ballast to be thermally protected (enclosed type). The 4,000V socket rating is required to safely withstand the pulse ignitor voltage — standard HID sockets rated below 4kV must be replaced. The burn position restriction to base-up and horizontal is a physical arc tube design requirement; base-down installation causes the arc to strike in the wrong orientation relative to the arc tube geometry, generating thermal stress that shortens lamp life.

Enclosed Fixture Requirement, Mercury Content & Disposal

This lamp must be installed in an enclosed fixture housing — open-face operation creates UV radiation hazard and fragment risk from the high-pressure arc tube. Following any power interruption, allow a 7–15 minute hot restrike cool-down interval before the pulse ignitor can safely re-fire the lamp. This lamp contains mercury and must be recycled through a certified lamp recycling program — do not discard in standard municipal solid waste. This product cannot be shipped to CA, CO, HI, ME, MN, OR, RI, or VT.

Industry Cross-Reference Data

• GE Lighting: MVR320/PS-BU/HOR (equivalent 320W pulse-start MH E39 4300K)
• Philips: MH320/PS/BU/HOR/4K (equivalent 320W pulse-start metal halide mogul)
• Venture Lighting: MP320/PS-BU/HOR (equivalent 320W PSMH E39 base-up/horizontal)
• Legacy Cross-Reference: Direct replacement for 320W ANSI M154/M132 pulse-start metal halide E39 base-up/horizontal lamp positions in high-bay, outdoor area, parking lot, and commercial security fixture installations

Bulk Commercial Lighting Supply & Project Support

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For formal wholesale inquiries, volume pricing modifications, or manufacturer spec sheet documentation, reach our commercial branch directly at 1-800-235-3489. We are your commercial supply partners as an authorized wholesale Lighting Distributor In Doral, Florida.