Keep your Promethean display online with a direct replacement lamp from Battery Technology. This BTI lamp is specified for Promethean PRM25 compatibility and cross-references PRM25-LAMP and 5811100784-S, making it a practical choice when the original light source reaches end of life. For IT teams supporting classrooms, training rooms, and shared collaboration spaces, lamp replacement is often the fastest path back to service. Replacing only the lamp preserves the projector investment while restoring the image output needed for instruction, presentations, and day-to-day operations. This part is intended for buyers who need a compatible replacement rather than a full projector refresh. It fits the procurement profile of organizations that value continuity, predictable maintenance, and lower total replacement cost. When uptime matters, a verified lamp replacement keeps the display environment moving without unnecessary hardware changes.