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Small clear halogen capsule with two pins

OSRAM

OSRAM 64427 S 20 W 12 V GY6.35 Starlite Halogen Bulb

SKU CH-YBHH-5GPWV

A 12 V halogen capsule producing 300 lm at 2800 K with a GY6.35 base and 2000-hour rated life

  • TypeHalogen Bulbs
  • Lumen Range300
  • Wattage20
  • Color Temperature2800K
  • Life Time Hours2000
  • Color Rendering Index100
  • Bright 300 lumen output from 20 watt halogen capsule
  • 100 CRI delivers accurate colour rendering for accent tasks
  • UV-stop quartz cuts UV-B and UV-C radiation by 90%
  • Dichroic reflector reduces heat in the beam by 66%
  • 2000 hour rated life approved for open luminaires per IEC 60598-1

Compact Low-Voltage Halogen Source

The OSRAM 64427 S is a 20 watt, 12 volt halogen capsule with a GY6.35 bi-pin base. It delivers 300 lumens at a warm 2800K colour temperature and a perfect colour rendering index of 100. The lamp is built for residential, commercial and industrial fixtures that require a small, high-performance light source.

Output, Life and Thermal Limits

Rated for 2000 hours of average life, the axial filament design supports efficient reflector systems that focus light precisely on the target. A dichroic reflector cuts heat in the beam by up to 66 percent, while UV-stop quartz reduces UV-B and UV-C radiation by 90 percent compared to regular quartz. The capsule is approved for open luminaires under IEC 60598-1, but it is not suited for installations needing higher lumen output or longer maintenance intervals.

UV Protection and Open-Fixture Approval

Advanced UV-control quartz and an integrated UV filter block harmful radiation, allowing the bulb to operate safely without additional shielding glass. The low-pressure, mercury-free construction meets the open luminaire standard directly. Fixtures without adequate ventilation or those requiring a different base type cannot use this lamp.

Highlights

  • Bright 300 lumen output from 20 watt halogen capsule
  • 100 CRI delivers accurate colour rendering for accent tasks
  • UV-stop quartz cuts UV-B and UV-C radiation by 90%
  • Dichroic reflector reduces heat in the beam by 66%
  • 2000 hour rated life approved for open luminaires per IEC 60598-1

Specifications

BrandOSRAM
TypeHalogen Bulbs
Lumen Range300
Wattage20
Color Temperature2800K
Life Time Hours2000
Color Rendering Index100

Questions about this item

Will the GY6.35 base fit the 12 V transformer I already use for other low-voltage halogen bulbs?

Yes, the GY6.35 bi-pin base is designed for 12 V low-voltage systems and will work with a compatible 12 V transformer rated for at least 20 W.

How can I confirm the bulb is delivering its rated 300 lumen output at 2800 K after installation?

The bulb should produce a warm white light with a CRI of 100, rendering colours accurately; if the beam appears dim or discoloured, check the transformer voltage and wiring.

Does the box include a dichroic reflector or any shielding, or must I buy a compatible luminaire separately?

The capsule itself has a UV-stop quartz envelope and integral UV filter; it is approved for open luminaires per IEC 60598-1, so no extra shielding is required, but a suitable GY6.35 socket fixture is needed.

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