The 4622 is a dimmable LED filament candle with a BC base. It is rated at just 4w but produces 470 lumens, the equivalent to a 40w filament lamp. The LED filament strands replicate the vintage look of a decorative filament creating a warm pleasing atmosphere. Ideal for chandeliers and clear glass fittings where the lamp and the light it creates is central to the look and mood of the room you are lighting. Please see below for the recommended LED dimmer switch.