1.5W G4 LED Capsule Bulb - 4000K Cool White 12V

The Knightsbridge G4LED6 is a 1.5W G4 LED capsule bulb delivering 110 lumens at 4000K cool white on 12V AC or DC supply. The G4 bi-pin base fits standard low-voltage capsule sockets used in under-cabinet lighting, bathroom mirrors, cooker hoods, display cabinets and some desk lamps. The frosted thermoplastic diffuser spreads the LED output across a 120-degree beam angle, providing even light distribution without visible LED dots.

Designed as a direct replacement for halogen G4 capsules, the bulb operates on 12V transformers — both electronic AC and DC types are compatible, which simplifies retrofitting existing installations. The 1.5W consumption replaces 10-15W halogen equivalents, reducing heat output and transformer load. The cool white 4000K colour temperature suits task lighting in kitchens, work areas, bathrooms and office spaces where clear visibility is needed over ambient warmth.

The bulb measures 10.2mm diameter and 32mm height, making it compact enough for recessed or enclosed fixtures with limited clearance. The thermoplastic construction withstands typical operating temperatures without yellowing, and the IP20 rating confirms suitability for indoor dry locations. The bulb is rated for 25,000 hours L70B50 life (the point at which 50% of a batch will have degraded to 70% of original output), which at 6 hours daily use equates to approximately 11 years before replacement.

This is a non-dimmable bulb. Pairing it with a dimmer switch may cause flickering, premature failure or incompatibility warnings. For dimmable G4 LED options, see alternative models in the Knightsbridge range.

Product Specification Sheet

Is this bulb dimmable?

No. This is a non-dimmable LED bulb. Using it with a dimmer switch may cause flickering, buzzing or premature failure. For dimmable G4 LED bulbs, check the Knightsbridge range for alternative models.

What transformer does it work with?

The bulb runs on 12V AC or DC transformers. It is compatible with both electronic and magnetic transformers rated for the appropriate load. Ensure your transformer can handle the reduced wattage of LED bulbs — many older transformers designed for 20W halogen loads may require a minimum load that a single 1.5W LED does not meet.

What is the light colour like?

The 4000K cool white colour temperature produces a neutral white light closer to daylight than warm white (2700K-3000K). It is commonly used in kitchens, bathrooms, offices and work areas where clarity and focus are needed over ambient warmth.

How long does the bulb last?

The bulb is rated for 25,000 hours L70B50 life, meaning 50% of a batch will still produce at least 70% of the original 110 lumens after 25,000 hours of operation. At 6 hours daily use, this equates to approximately 11 years before replacement is likely needed.