Dell 311-9421 Projector Lamp Replacement Northstar AV sells OEM (Original Equipment Manufacturer) Lamps - Philips, Osram/Sylvania & SHP brand lamps inside of OEM spec housings. We DO NOT sell generic or compatible replacement lamps. Projector Lamp Model: 311-9421 Compatible Projectors Models: Dell 7609WU Average Lamp Hours: 2000-3000 Hours Lamp Type: UHB Warranty: 180 Day Warranty (From Date of Install)