GOLDENRIVER RLC-030 Projector Lamp for Viewsonic PJ503D Type: Brand new compatible projector lamp with housing Part number: RLC-030 Compatible machine model: for VIEWSONIC PJ503D Up to 2000 (normal) / 2500(economy) hours Life Guarantee: 30 days Refund & 120 days Warranty; Professional customer service support. Any other problems with the projector lamp, please contact us