NP21LP Projector Replacement Lamp with Housing for NEC NP-PA500U / NP-PA500X / NP-PA5520W / NP-PA600X / PA500U / PA550W / PA600X / NP-PA550W / PA500X Projectors Lamp Type: Compatible Lamp Bulbs Part number: NP21LP Model number: compatible with NEC NP-PA500U / NP-PA500X / NP-PA5520W / NP-PA600X / PA500U / PA550W / PA600X / NP-PA550W / PA500X Wattage & Lifespan: 330 Watts ; Up to 2500 (normal) / 3000(economy) hours Life Guarantee: 30 days Refund & 150 days Warranty; professional customer service support. Any other problems with the projector lamp, please contact us