Sylvania 64191 MS400-PS-BD-ONLY-BT28 – 400W | CRI 65 | ANSI M155/E, M135/E | ± 15° Burn Position | E39 Mogul Screw

The Sylvania 64191 MS400-PS-BD-ONLY-BT28 is a 4100K Cool White Pulse-Start Metal Halide (PSMH) — Metalarc lamp, CRI 65, ANSI M155/E, M135/E, -Down ± 15° Burn Position, 20,000 hours rated life, ± 15° Burn Position burn position. Enclosed Fixtures Only. Requires a compatible HID ballast. Mercury content — dispose per local regulations. UPC: 46135641916.

Quick Specs

• Brand: Sylvania
• Series: Metalarc Pulse-Start
• Sylvania Order Code: 64191
• UPC: 46135641916
• ANSI Code: M155/E, M135/E
• Lamp Type: Pulse-Start Metal Halide (PSMH) — Metalarc
• Color Temp 4100K Cool White
• CRI: 65
• Rated Average Life: 20,000 hours
• Base Type: E39 Mogul Screw
• Overall Length / Diameter (MOL): 8.5in x DIA 3.5in
• Burn / Operating Position: ± 15° Burn Position
• Fixture Compatibility: Enclosed Fixtures Only
• Start Type: Pulse-Start — requires pulse-start ballast
• Mercury Content: Contains mercury — dispose per local regulations.

Product Overview

The Sylvania 64191 MS400-PS-BD-ONLY-BT28 is a 4100K Cool White 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: Enclosed Fixtures Only.

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 (E-type). 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: 64191
• ANSI Code: M155/E, M135/E
• UPC: 46135641916
• Wattage:400W
• Base: -Down ± 15° Burn Position
• 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.