*Applicable projector model: for Viewsonic PA503S PA503X PG603X PS600X PA500S PS501X PA502XE PA502SE PA503XP PA503SP VS16905 VS16909 Projector ^^ *Gzwog provides high quality, high brightness, long life, good stability, original brightness, accurate matching Projector Lamp ^^ *Gzwog Lamp's lifetime approximately 4500 hours and 230 days warranty ^^ *Gzwog Lamp's must be tested before delivery, please feel free to use it ^^ *Gzwog provide the best quality return service and friendly customer service, all messages will be answered as soon as possible