This DDS projector lamp is a high-quality projection light bulb that is perfect for microfilm readers and other similar devices. It has a voltage of 21v and a power of 80w, making it suitable for a wide range of applications. The bulb is specifically designed for use with Norelco products, ensuring optimal performance and compatibility.In addition to Norelco, this bulb is also compatible with several other brands, including ab, dick, Kindermann, bruning, northwest, and micron. This makes it a versatile option for anyone in need of a reliable and efficient projector lamp. Whether you are a professional photographer or simply looking to upgrade your home theater setup, this DDS projector lamp is an excellent choice.