OSRAM 64255 MR11 – Halogen lamp with dichroic reflector 20 W, 8 V (G4) for medical and projection use

OSRAM 64255 MR11 – Halogen lamp with dichroic reflector 20 W, 8 V (G4) for medical and projection use

The OSRAM 64255 MR11 is a low-voltage (8V) halogen lamp with an MR11 dichroic reflector and a G4 (GU4) base, designed for medical instrumentation, microscopy, and projection lighting. With a nominal power of 20W , a color temperature of 3200K , and a CRI of 100 , it offers a clean and stable beam, with precise filament and reflector alignment for consistent photometric performance. The family includes XENOPHOT HLX versions (using xenon gas instead of krypton) that provide up to 10% more luminous flux with the same power consumption. Its 26mm focal length , 35mm diameter , and 32mm overall length facilitate integration into compact fixtures and precision optics.

Main features

• Technology: Low voltage halogen with MR11 dichroic reflector .
• Power / voltage: 20 W / 8 V ( AC current).
• Socket: G4 (GU4) , 2 pins.
• Color and light quality: 3,200 K , CRI 100 .
• Precision optics: 26 mm focal length ; exact filament-reflector alignment for maximum efficiency.
• Compact format: Ø35 mm (MR11) · length 32 mm .
• Average lifespan: 50 h (intensive professional use).
• HLX options: XENOPHOT HLX versions with xenon gas and +10% flow compared to standard halogens (same power).
• Regulation: dimmable with suitable power supplies.

Product benefits

• Stable and repeatable performance for critical tasks in microscopy , endoscopy , fiber optic illuminators and projection .
• Greater efficiency in HLX variants, while maintaining geometry and mechanical compatibility.
• Easy integration into existing equipment thanks to the MR11 format and G4 base, widely used in the medical and scientific sector.
• Superior color quality (CRI 100) for natural color reproduction in diagnostic and analytical applications.

Use cases

• Illumination in microscopes and slit lamps .
• Fiber optic illuminators in laboratories and dental offices.
• Projectors and industrial vision systems that require a compact and precise source.
• UV curing and analysis equipment with constant beam requirements.

Frequently Asked Questions

• Is it equivalent to GU4? Yes. The G4 (GU4) base is the two-pin socket with 4 mm spacing commonly used in low-voltage MR11s.
• Can I replace it with an HLX version? If your equipment supports the same power and geometry, the XENOPHOT HLX version delivers up to +10% flux while maintaining 20W/8V.
• Can it be regulated? Yes, with compatible power supplies/drivers for low-voltage halogen lamps.
• Is it suitable for home lighting? No, it's a special lamp for professional equipment (medical, laboratory, projection).

Installation and recommendations

Check the voltage compatibility (8V) , the G4 base, and the space for the MR11 Ø35 × 32 mm bulb. Avoid touching the bulb; handle with gloves or a clean cloth. Use power supplies suitable for low-voltage halogen lamps and follow the equipment manufacturer's instructions (operating position, ventilation, and heat dissipation). Always replace with original part numbers to maintain optical performance.

Project description

Halogen lamp with MR11 dichroic reflector ; 20 W , 8 V AC ; G4 base; 3,200 K , CRI 100 ; focal length 26 mm ; dimensions Ø35 × 32 mm ; life 50 h ; dimmable; HLX versions (xenon gas) with +10% luminous flux.