This Crompton Lamps 2.5W dimmable LED candle light bulb with a BC-B22d bayonet (22mm) fitting is a direct replacement for a traditional 25W light bulb, but has the potential to reduce your home lighting bills & reduce the frequency of needing to replace your light bulbs.LED filament technology is much more energy efficient than traditional light bulb technologies such as incandescent bulbs. This not only helps you save on your energy bills but also helps the environment too. Whereas a traditional light bulb would use 25W to produce 250lm, this LED version uses just 2.5W equating to an energy-efficiency of 100lm/W. The beauty of LED filament light bulbs is truly enchanting, seamlessly blending vintage aesthetics with cutting-edge technology. The LED filaments within these bulbs mimic the classic look of incandescent bulbs, casting a glow that exudes nostalgia. Furthermore, LED filament bulbs extend beyond their aesthetic appeal by providing both energy-efficient operation & long-lasting durability, thus positioning them as a sustainable & environmentally friendly lighting choice. With a long life of 15000-hours, this LED candle light bulb boasts an incredible 8.2-year lifespan if used for 5-hours a day. These light bulbs dont need to be replaced as often which results in less money spent on replacement bulbs, & less time spent replacing them, too. Combine this superior longevity, negligible maintenance & replacement costs with the LED light bulbs notable energy efficiency then the savings gleaned from each light bulb has the potential to reduce your lighting costs by up to 90%. This dimmable lamp features Duo Dim™ Technology making it compatible with most leading & trailing edge dimmers. Cool white (4000K) bulbs produce a cooler, crisp light & are well suited to more stimulating environments. This makes them great in kitchens, workplaces & is also excellent for bathrooms as there is no colour cast; so applying makeup is much easier. Unlike older other energy-saving technologies, LED bulbs light up instantly, with no waiting time to warm up to full brightness. With a size of 35mm diameter with 91mm height, this LED candle light bulb will retrofit directly to any existing BC-B22d fixture; whether that be smaller domestic light fittings such as chandeliers or wall sconces or up to large-scale commercial installations.