The light source in your projector is called a lamp, although many users refer to them as bulbs or light bulbs. To find a replacement lamp (bulb), click on Lamps
under Where to Buy
in the navigation to the left. This will present you with a list of lamp dealers. Adjacent to the list of dealers is a yellow column of projector brands. Click on the brand of projector that you own and you will be presented with a list of dealers that sell lamps (bulbs) for that brand.