This high-quality projector lamp is perfect for use in microfilm readers, slide projectors, and movie projectors. It boasts a voltage of 21v and a power of 80w, ensuring a bright and clear projection. The lamp is compatible with a variety of brands, including Apollo, ab, dick, For Kindermann, bruning, northwest, and micron. Whether you're a professional photographer or simply looking to display your favorite films and slides, this projector lamp is an excellent choice. It provides reliable, long-lasting performance, and is sure to meet all of your projection needs.