This new replacement front projector lamp DT00521-ER from eReplacements is 100% compatible with your dt00521er lamp compatible and has an estimated lamp lifetime of approximately 2,000 hours. This lamp is user replaceable. Refer to your projector’s manual for replacement instructions for this lamp. eReplacements front projector lamps will meet or exceed the original dt00521er lamp compatible lamp specifications because they are manufactured for high performance using top quality replacement bulbs and the most up to date safety and engineering control standards.