Energizer 4.2W G9 Dimmable LED Capsule Bulb - Cool White 4000K

The Energizer 4.2W G9 LED capsule bulb is a dimmable G9 bi-pin LED that delivers 470 lumens at 4000K cool white, replacing traditional 40W halogen G9 capsules while consuming 4.2W. The G9 base pushes directly into G9 lamp holders without twisting, making installation straightforward in pendant lights, wall lights, ceiling fittings and decorative lamps that accept G9 capsules.

Designed for kitchens, bathrooms, utility rooms and workspaces where cooler light aids task visibility, the 4000K colour temperature sits between warm white and daylight, providing neutral white light without the yellow cast of 2700K bulbs or the clinical brightness of 6000K. The dimmable function allows brightness adjustment from full 470 lumens down to a lower ambient level when paired with compatible LED dimmers, making the bulb adaptable to different activities and times of day.

The capsule measures approximately 15mm diameter by 50mm length, fitting compact G9 fittings where space behind the shade or diffuser is limited. The bulb starts instantly at full brightness without warm-up delay, and operates flicker-free across the dimming range when used with appropriate dimmers. Energizer rates the lifespan at 15 years based on average use, significantly reducing replacement frequency compared to halogen equivalents that typically last 1-2 years.

Is this bulb compatible with all dimmer switches?

The bulb is dimmable but requires an LED-compatible dimmer switch. Older dimmer switches designed for halogen or incandescent bulbs may cause flickering, buzzing or limited dimming range. Check your dimmer's specification or test with a single bulb before installing multiples in the same circuit.

What's the difference between 4000K and warm white bulbs?

4000K cool white produces a neutral white light without the yellow warmth of 2700K-3000K warm white bulbs. Cool white is often preferred in kitchens, bathrooms and task areas where colour accuracy and visibility matter, while warm white suits living rooms and bedrooms where a cosier atmosphere is wanted.

How does this compare to a 40W halogen G9?

This 4.2W LED produces the same 470 lumens as a typical 40W halogen G9 while using approximately 90% less electricity. The LED also generates significantly less heat, making it safer in enclosed fittings and reducing cooling loads in warm weather.

Does the bulb fit all G9 fixtures?

The G9 bi-pin base is a standard size and fits any G9 lamp holder. The capsule body measures approximately 15mm x 50mm, which is slightly larger than some halogen G9s. Check clearance in very tight or enclosed fittings, particularly older decorative wall lights with shallow back plates.