Amazon.com: 331-2839/317-1135/725-10134/725-10284 Replacement Lamp Special Upgraded Design Bare Bulb Inside with Housing for Dell 4220 4320 4210X 4310WX 4610X Projector by WiseGear : Electronics
Amazon.com: CTLAMP Compatible 331-2839/725-10284 Replacement DLP/LCD Projector Lamp Bulb with Housing Compatible with Dell 4220 4230 4320 : Electronics