For BL-FU310B Replacement Projector Lamp with Housing for OPTOMA EH500 X600 Projectors -Kosrae For OPTOMA EH500 X600 Projectors. For BL-FU310B replacement projector lamp with housing. Our projector bulbs provide customers with 180 days warranty and 30 days 100% refund guarantee. Shipping box with foam ensures complete protection for your package. KOSRAE strictly controls quality from bulb burner to projector housing.