AuraBeam Economy Replacement Projector Lamp for Dell 311-9421 With Housing Aurabeam Projector solutions. From the economic to the professional versions our lamps ensure great quality Economic version: Affordable option for the low use consumer, designed to ensure the best quality on a low budget Easy install: Housing included, minimize installation time to make sure your device is back in action! Contact: Do you have an issue or question regarding the lamp or the compatibility of your device? Email us, our Customer Service is here to help you. User Protection: The Economic series lamps include a 90 day replacement warranty and a 30 day refund warranty,