Keep classroom and training-room projection working with a replacement lamp designed for Promethean ActivBoard 178 systems. When the original lamp reaches end of life, image quality drops fast. Replacing the lamp is the fastest way to recover usable brightness and keep lessons, presentations, and collaborative sessions on schedule. Battery Technology’s PRM35-LAMP-BTI is a focused service part for organizations that need to maintain installed AV assets rather than replace them. It supports a more controlled refresh strategy: preserve the projector hardware already in place, restore output where it matters, and avoid the cost and disruption of a full system swap. For education and enterprise environments, that means fewer interruptions, simpler maintenance planning, and better return from existing projector infrastructure. It is the right kind of replacement when the display platform is still viable and only the lamp needs attention. Choose this lamp to keep Promethean projection systems productive and to extend the useful life of the room technology you already own.