4W Dimmable G9 LED Capsule Bulb - 4000K Cool White

The Knightsbridge G9LED17 is a 4W G9 LED capsule bulb delivering 430 lumens at 4000K cool white, designed as a direct replacement for traditional 28-33W G9 halogen capsules. The bulb is dimmable when paired with compatible trailing or leading edge dimmer switches, though dimmer compatibility should be verified before installation as not all dimmer models support LED loads equally.

G9 capsules are common in wall lights, decorative fittings, and under-cabinet kitchen lighting where a compact bulb with wide light spread is needed. The 4000K colour temperature produces a neutral cool white light that suits task lighting in kitchens, bathrooms and workspaces where colour accuracy and alertness are valued over warm ambience. The 270-degree beam angle distributes light broadly from the bulb, replicating the omnidirectional pattern of the halogen bulbs it replaces.

The bulb measures 54mm tall by 19mm diameter, fitting most G9 fittings designed for halogen capsules, though depth-restricted luminaires should be measured before purchase. The ceramic and polycarbonate construction with clear diffuser allows the individual LED chips to be visible when unlit. The bulb carries a 3-year warranty and an L70B50 rating of 25,000 hours, meaning half the bulbs in a batch will still deliver at least 70% of initial light output after 25,000 hours of use.

Product Specification Sheet

Is this bulb dimmable with all dimmer switches?

The bulb is designed to work with both trailing edge and leading edge dimmers, but compatibility depends on the specific dimmer model. Some older dimmers designed for halogen loads may cause flicker or limited dimming range with LEDs. Test with your existing dimmer before installing multiple bulbs, or consult the dimmer manufacturer's LED compatibility list.

What wattage halogen bulb does this replace?

The 4W LED delivering 430 lumens replaces a 28-33W halogen G9 capsule. The actual brightness match depends on the specific halogen bulb previously fitted, but most standard G9 halogens fall within this wattage range.

What does 4000K cool white look like compared to halogen?

Halogen bulbs typically produce light around 2700-3000K with a warm yellow-white tone. This 4000K bulb produces a noticeably cooler, more neutral white light similar to daylight fluorescent tubes. It suits task lighting in kitchens and bathrooms but may feel clinical in living rooms or bedrooms where warmer light is preferred.

Will this fit my existing G9 fitting?

The bulb is 54mm tall and 19mm in diameter. Most G9 wall lights and decorative fittings designed for halogen capsules will accommodate this size, but measure the internal depth of enclosed fittings before purchase. Some very compact G9 fittings may not have clearance for the 54mm height.