Osram 64255 20W 8V GZX4 / G4 Bi-Pin MR11 Halogen Lamp — NAED 54122 — Microscopy, Medical & Projection

Specifications

• Bulb Type: MR11 Halogen Reflector — Clear, Open Face
• Wattage: 20W
• Voltage: 8V (Low Voltage)
• Base Type: GZX4 / G4 Bi-Pin (2-Pin, 4mm pin spacing)
• NAED / Sylvania Code: 54122
• Osram Order Code: 64255
• Osram EAN / Product Code: 4050300006833
• Color Temperature: 3,200K (Warm White)
• Color Rendering Index (CRI): 100 (Perfect color accuracy)
• Average Rated Life: 50 Hours
• Max Overall Length (MOL): 32.0 mm (1.26 in)
• Light Center Length (LCL): 26.0 mm
• Bulb Diameter: 35.0 mm (1.38 in)
• Burn Position: Horizontal ±15° only (p90/p15) — see note below
• Dimmable: Yes
• Fixture Requirement: Approved Enclosed Halogen Fixtures Only
• Country of Origin: Germany / Mexico (verify on packaging — sourcing varies by production run)

The Osram 64255 is a single-ended, low-voltage tungsten halogen MR11 reflector lamp engineered for demanding medical diagnostic, microscopy, dental, and projection applications. With a perfect CRI of 100, a 3,200K color temperature, and precision filament alignment achieved through Osram's patented quartz pinch technology, it delivers consistent, true-to-life illumination where optical accuracy is non-negotiable. Dimmable and instant-on, it is a trusted standard replacement across a wide range of professional scientific and AV equipment.

Key Features

• CRI 100: Perfect color rendering — essential for accurate tissue examination, specimen analysis, and image fidelity in projection
• Precision Filament Alignment: Manufactured using Osram's patented quartz pinch technology for repeatable optical accuracy
• Instant On: Reaches full brightness immediately — no warm-up delay
• Nearly Constant Luminous Flux: Stable light output maintained throughout the rated lamp life
• Dimmable: Compatible with dimming controls where equipment supports it

Compatible Applications

• Microscopy & Laboratory Instruments (including Leica, Zeiss, Nikon, Olympus)
• Medical Diagnostic Lighting
• Dental Examination Equipment
• Slide & Film Projectors
• Ophthalmic Instruments & Slit Lamps
• Endoscopy & Surgical Lighting Equipment
• AV & Audiovisual Projection Systems

Cross-Reference Part Numbers

This lamp is interchangeable with equipment specifying the following manufacturer part numbers:

• Osram / Sylvania: 64255 / NAED 54122
• Ushio: 1000108 / JCR8V-20W
• Eiko: 54122
• GE / Tungsram: Q20MR11/8V
• Philips: 6893P / 13495
• Hikari: JCR-8V20W

Important Safety & Installation Notes

• Burn Position is Critical: This lamp must be operated horizontally within ±15° of true horizontal only. Installing it in a vertical or angled position beyond this range will cause overheating and severely shorten lamp life.
• Enclosed Fixtures Only: Must be used exclusively in approved, fully enclosed halogen fixtures. Do not use in open or unshielded housings.
• No Bare Hands: Never touch the bulb envelope or inside of the reflector with bare skin. Oils from your fingers create hot spots that cause premature failure or lamp burst. Use clean gloves or a lint-free cloth during installation.
• Precision LCL Matters: The 26.0 mm Light Center Length positions the filament at the exact focal point of the instrument's optical system. Using a lamp with a different LCL will degrade image quality, illumination uniformity, and instrument performance.
• Do Not Exceed Rated Voltage: Operating above 8V will dramatically shorten lamp life. Verify your equipment's transformer output before installing.
• Extreme Heat Warning: This lamp operates at very high temperatures. Never touch when lit or recently switched off. Keep away from combustibles including paper, plastics, and cloth.
• Eye Safety: Do not look directly at the operating lamp. Intense visible and UV output can cause serious eye injury.
• Fragile: Quartz halogen lamps are highly sensitive to vibration and impact. Do not drop, shake, or bend. Inspect the envelope for any cracks before installation.