Sylvania 64391 - MP320/350-PS-BU-ONLY-BT28 – 320W/350W (dual: 320W/350W) | ANSI M154, M132, M131 | Base-Up ±15° | E39 Mogul Screw

The Sylvania 64391 - MP320/350-PS-BU-ONLY-BT28 is a Pulse-Start Metal Halide (PSMH) — Metalarc lamp, ANSI s: M154, M132, M131, O, E39 Mogul Screw, 20,000 hours rated life, Base-Up ±15° burn position. Open or Enclosed. Requires a compatible HID ballast. Mercury content — dispose per local regulations. UPC: 46135643910. Item: MP320/350/PS/BU-ONLY/BT28.

Quick Specs

• Brand: Sylvania
• Series: Metalarc Pulse-Start
• Sylvania Order Code: 64391
• Manufacturer Part Number: MP320/350/PS/BU-ONLY/BT28
• UPC: 46135643910
• ANSI Code: M154, M132, M131
• Lamp Type: Pulse-Start Metal Halide (PSMH) — Metalarc
• Color Temp 3800K/3600K dual CCT
• Rated Average Life: 20,000 hours
• Base Type: EX39 Extended Mogul Screw (protected shield — rated for open or enclosed fixtures)
• Overall Length / Diameter (MOL): 8.31" Length × 3.5" Diameter
• Burn / Operating Position: Base-Up ±15°
• Fixture Compatibility: Open or Enclosed
• Start Type: Pulse-Start — requires pulse-start ballast
• Mercury Content: Contains mercury — dispose per local regulations.

Product Overview

The Sylvania 64391 - MP320/350-PS-BU-ONLY-BT28 is a Pulse-Start Metal Halide (PSMH) — Metalarc for commercial and industrial HID lighting in high-bay, outdoor, and area lighting applications. Pulse-start technology delivers faster warm-up, improved lumen maintenance, and longer rated life compared to standard probe-start metal halide lamps. Rated life: 20,000 hours. Fixture: Open or Enclosed.

Requires a pulse-start compatible HID ballast and pulse-rated socket. Mercury content — dispose per local regulations.

Applications

• Commercial and industrial HID lighting – Commercial and industrial hid lighting in high-bay, outdoor, and area lighting applications.
• Retrofit and maintenance replacement – Verify ANSI code, wattage, and burn position before ordering. Pulse-start lamps require a pulse-start ballast — not interchangeable with probe-start.

Safety and Installation

• Compatible HID ballast required. Pulse-start ballast required — do not use on probe-start ballast.
• Enclosed fixture required. Use only in enclosed fixtures rated for this lamp.
• Allow warm-up time: 5–10 minutes for full output.
• Hot restrike: Allow 7–12 minutes after switching off before restarting.
• UV radiation: This lamp emits UV radiation. Use only in fixtures with UV-protective shielding.
• Mercury disposal: Contains mercury — dispose per local lamp recycling regulations.

Ordering Information

• Brand: Sylvania
• Series: Metalarc Pulse-Start
• Sylvania Order Code: 64391
• ANSI Code: s: M154, M132, M131, O
• UPC: 46135643910
• Wattage:320W/350W (dual: 320W/350W)
• Base: E39 Mogul Screw
• Case quantities and bulk pricing: Contact ADL Supply for volume orders.

Compliance

• Contains mercury — dispose per local lamp recycling regulations.
• Verify RoHS and Prop 65 compliance with Sylvania specification sheet.

ADL Supply recommends confirming all specifications with the Sylvania product data sheet prior to installation.