Restore projection performance without replacing the entire system. BTI SP-LAMP-027-BTI is a replacement projector lamp designed for a broad set of legacy business projectors, including InFocus IN42 and IN42+, ASK C445 series, Hitachi CP-X models, ViewSonic PJ1158, and select 3M and Dukane units. That compatibility matters when the projector itself is still serviceable, but lamp failure has taken the room offline. For IT teams supporting conference rooms, training spaces, and shared AV environments, a verified replacement lamp reduces downtime and avoids the cost and disruption of a full projector refresh. BTI is a practical choice when you need a part that fits the installed base and gets the room back to work quickly. This lamp is especially useful in environments where older projection hardware remains standardized across multiple rooms. Instead of forcing a platform change, you can extend the life of existing assets and preserve the original deployment footprint. That makes procurement simpler, support easier, and replacement planning more predictable.