Sylvania 64525 MS400/PS-BU-ONLY/BT28 – 400W | 4000K Cool White | CRI 65 | ANSI M155/S, M135/S | Base-Up Dedicated 

The Sylvania 64525 MS400/PS-BU-ONLY/BT28 is a 400W Pulse-Start Metal Halide (PSMH) — Metalarc lamp, CRI 65, ANSI s: M155/S, M135/S, E26 Medium Screw, 15,000 hours rated life, Base-Up Dedicated burn position. Enclosed or Open Fixtures*. Requires a pulse-start compatible HID ballast and 4,000V pulse-rated socket. UPC: 46135645259. Item: 64525.

Quick Specs

• Brand: Sylvania
• Series: Metalarc Pulse-Start
• Sylvania Order Code: 64525
• Manufacturer Part Number: 64525
• UPC: 46135645259
• ANSI Code: M155/S, M135/S
• Lamp Type: Pulse-Start Metal Halide (PSMH) — Metalarc
• Color Temperature: 4000K Cool White
• Wattage: 400W
• CRI: 65
• Rated Average Life: 15,000 hours
• Base Type: E39 Mogul Screw
• Overall Length / Diameter (MOL): 11.5 in MOL × 4.5 in Diameter
• Burn / Operating Position: Base-Up Dedicated
• Fixture Compatibility: Enclosed or Open Fixtures*
• Start Type: Pulse-Start — requires pulse-start ballast and 4kV socket
• Mercury Content: Contains mercury — dispose per local regulations.

Product Overview

The Sylvania 64525 MS400/PS-BU-ONLY/BT28 is a 400W Pulse-Start Metal Halide (PSMH) — Metalarc for commercial and industrial HID lighting. CRI 65. Rated life: 15,000 hours. Enclosed or Open Fixtures*.

Requires a pulse-start compatible HID ballast and 4,000V pulse-rated socket. Mercury content — dispose per local regulations.

Applications

• Commercial and industrial HID lighting – High-bay warehouses, outdoor area lighting, parking lots, retail, and security lighting.
• 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

• Pulse-start ballast required. Requires a pulse-start compatible HID ballast and 4,000V pulse-rated socket.
• Fixture: Enclosed or Open Fixtures*.
• Burn position: Base-Up Dedicated.