The PHILIPS LAMP ASSY 400/4100 UHP (designated as Lamp 9903) is a genuine replacement UHP (Ultra High Performance) lamp module designed for compatible Philips and other major brand professional projectors. This lamp assembly is not just the bulb but a complete, factory-sealed module that includes the UHP lamp, a reflector, and an integrated igniter/ballast circuit board, all housed in a metal casing. This all-in-one design ensures perfect optical alignment and electrical compatibility, guaranteeing optimal light output, color consistency, and reliable performance upon installation. The lamp is rated at 400 watts with a nominal luminous output of 4100 lumens, making it suitable for mid-to-high-brightness projectors used in business, education, and large-venue applications where consistent, bright, and color-accurate projection is required.

This replacement module is engineered for safety and ease of installation, featuring a plug-and-play design that allows users or technicians to replace the lamp without tools in many projector models. The sealed housing protects the sensitive internal components from dust and oils, which can significantly reduce lamp life and cause premature failure. Using a genuine Philips lamp assembly ensures that the projector operates within its designed thermal and electrical parameters, maintaining system reliability and protecting the projector's optical engine from potential damage caused by inferior or mismatched components. The lamp typically offers a rated life of several thousand hours, depending on the projector's operational mode (e.g., standard or eco mode), providing a long service life before the next replacement is needed.

For facilities managers, AV technicians, and end-users, the PHILIPS LAMP ASSY 400/4100 UHP represents a critical maintenance component to restore a projector's brightness and image quality. It is essential for maintaining the visual performance of presentation and display systems. Investing in a genuine lamp module from a reputable manufacturer like Philips ensures maximum performance, safety, and longevity for the projection system, avoiding the risks associated with counterfeit or substandard replacement parts.