The 6 Volt 21/5W incandescent bulb is a classic electric lamp commonly used in vehicles. With its dual wattage of 21/5W, it provides both bright and dimmed light, making it suitable for various applications like tail and brake lights. The bayonet fitting design allows for easy installation. Operating at 6 volts, it is ideal for older vehicles or special applications requiring lower voltage. This type of bulb is reliable and long-lasting, remaining a popular choice for situations where consistency and simplicity are essential.