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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

  • Power rating20
  • Light output300
  • Color temperature2800K
  • Lifespan (hours)2000
  • Color rendering100
  • Product typeHalogen Bulbs
  • 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.

How it compares

Measured against everything we stock in General-Purpose & Specialty Bulbs, at today’s prices. Recalculated every night.

Price $4.99
Cheaper than about 92% of the 1,791 comparable items (median $17.99).

Specifications

Product
Brand nameOSRAM
Product typeHalogen Bulbs
Display
Light output300
Power
Power rating20
More details
Color temperature2800K
Lifespan (hours)2000
Color rendering100

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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