CTLAMP NP21LP / 60003224 Original Projector Bulb NP21LP Lamp Inside Replacement Lamp with Housing Compatible with NEC NP-PA500U NP-PA500X NP-PA5520W NP-PA600X NP-PA550W Lamp Type: High Quality Original Projector Lamp with Housing Compatible Models: compatible with NEC NP-PA500U / NP-PA500X / NP-PA5520W / NP-PA600X / PA500U / PA550W / PA600X / NP-PA550W / PA500X Wattage& Lifespan: 330watts; Up to 2500 (normal) / 3000(economy) hours Life Guarantee: 30 days Refund & 365 days Warranty; professional customer service support. Any other problems with the projector lamp, please contact us CTLAMP is the only Authorized dealer of CTLAMP Products, focusing on projector lamps for a lone time. Well Customer Services, Buy with confidence