Sylvania 64488 / 64034 M400/U/BT28

Product Overview

Sylvania 64488 / 64034 M400/U/BT28 — 400W Metal Halide Lamp, 4000K, ANSI M59/E, E39 Mogul

The Sylvania 64488 / 64034 M400/U/BT28 is a 400-watt metal halide HID lamp from Sylvania's Metalarc series, designed for commercial, industrial, and outdoor area lighting in HID fixtures. With an E39 mogul screw base, ANSI code M59/E, 4000K cool white color temperature, CRI 65, BT28 bulb shape, probe-start operation, and a rated average life of 20,000 hours, this lamp delivers efficient, long-life illumination for enclosed HID fixtures. Enclosed fixtures only. Requires a compatible HID ballast. Verify ANSI code, wattage, and burn position before ordering.

Wattage

400W

Metal Halide

Color Temp

4000K

CRI 65

ANSI Code

M59/E

Ballast Code

Base

E39

Mogul Screw

Rated Life

20,000 hrs

Average Life

Technical Specifications

Brand	Sylvania — Metalarc
Sylvania Order Code	64488 / 64034
Manufacturer Part Number	M400UBT28-M59E-64488
Lamp Type	Metal Halide HID — Metalarc
Wattage	400W
ANSI Code	M59/E
CRI	65
Color Temperature	4000K Cool White
Base Type	E39 Mogul Screw
Bulb Shape	BT28
Start Type	Probe-Start — standard MH ballast
Burn / Operating Position	Not specified by manufacturer — verify before ordering*
Fixture Compatibility	Enclosed Fixtures Only
Rated Average Life	20,000 hours
Max Overall Length (MOL)	8.31"
Diameter	3.5"
Mercury Content	Contains mercury — dispose per local regulations
UPC	46135644887

*Source listing showed "Position" as the burn position value, which is not an actual orientation (such as Universal, Vertical, or Horizontal) and appears to be an unresolved placeholder. Please confirm the correct rated burn position with the Sylvania spec sheet before publishing, as HID lamp orientation affects both performance and fixture suitability.

Product Overview

The Sylvania 64488 / 64034 M400/U/BT28 is a 400W metal halide HID lamp from Sylvania's Metalarc series, built for commercial, industrial, and outdoor area lighting applications. At 4000K cool white with CRI 65, this lamp delivers the efficient, high-output illumination typical of metal halide technology, suited to large-area coverage where moderate color rendering is acceptable in exchange for efficacy and long service life.

This lamp uses probe-start technology, operating on a standard metal halide ballast without requiring a separate ignitor. As an E-type (enclosed fixture only) lamp, it must be installed only in fixtures specifically rated for enclosed operation — open fixtures do not provide adequate UV shielding or containment in the event of lamp failure. Allow 5–10 minutes warm-up time for full output, and 7–12 minutes hot restrike time after the lamp is switched off before it can be restarted.

Compatible Applications

Commercial and industrial HID lighting — Suited for warehouses, manufacturing facilities, and other large commercial interior spaces.
Outdoor area lighting — High-output illumination for parking lots, loading areas, and other large outdoor commercial spaces in HID fixtures.
Retrofit and maintenance replacement — Match ANSI code M59/E to existing ballast specification for like-for-like replacement.

Before Ordering — Verify

ANSI Code: Confirm your ballast is rated for M59/E metal halide operation.
Wattage: Confirm fixture and ballast are rated for 400W.
Burn Position: Not specified in available data — confirm the correct rated burn position with the Sylvania spec sheet before ordering.
Fixture Type: Confirm your fixture is rated for enclosed operation only.
Base Type: Confirm fixture socket accepts E39 Mogul Screw base.
Physical Fit: Confirm 8.31" MOL and 3.5" diameter fit within your fixture's lamp housing.

Safety and Handling Guidelines

Compatible HID Ballast Required: Use only with a metal halide ballast matched to ANSI code M59/E.
Enclosed Fixture Required: Use only in enclosed fixtures rated for this lamp (E-type).
UV Radiation Warning: This lamp emits UV radiation. Use only in fixtures with UV-protective shielding.
Allow Warm-Up Time: Allow 5–10 minutes for full output after starting.
Hot Restrike: Allow 7–12 minutes after switching off before attempting to restart.
Mercury Content: Contains mercury. Do not dispose of in regular trash. Recycle through an approved lamp recycling program.

Compliance

Contains mercury — subject to applicable lamp recycling and disposal regulations. This product cannot be shipped to CA, CO, HI, ME, MN, OR, RI, or VT due to state mercury lamp regulations.
Verify RoHS and Prop 65 compliance status with the Sylvania manufacturer specification sheet prior to use in regulated installations.