This product is either discontinued or we cannot get that from suppliers.
Optoma Lamp 5811100235-S, Rated Wattage 200W, Economic 4000 Hours, Normal 3000 Hours, High quality compatible Projector Bulb
The compatible bulb is made by the bulb manufacturer to meet the specifications and requirements for the Vivitek 5811100235-S Projector and to performs similar to the OEM bulb version.