Our Congaree 25 Watt, CA10 Incandescent, dimmable light bulb, warm white (2700K) E12/Candelabra Base is the perfect bulb to add an old-world feeling to your chandelier. In the early days of electrical lighting, inventors such as Thomas Edison tested and retested as they searched for long-burning filaments. In 1890, the filament choice was carbonized cotton. These bulbs have a tungsten filament, which is used to reproduce the single hairpin loop of a vintage design.