The 4-Watt Fancy Round Mirror Crown Dimmable LED filament Light Bulb Edison Screw E27 by LiquidLEDs is a decorative bulb that replaces 40-watt incandescent bulbs, providing up to 90% energy savings. It has a high-quality light with excellent colour rendering, no glare, and looks identical to incandescent bulbs. It is simple to use: just screw it on to a compatible fixture and switch it on. Features include 25,000-hour lifespan, dimmable, no mercury, and UV & IR emissions.