You never know when your projector's bulb might fail, so it is smart to carry a back-up on business trips or keep a spare one at the presentation facility. This replacement bulb from Dell™ is a life-saver, in case your 3400MP projector's bulb burns out. This durable 156-watt bulb will give you approximately 3000 hours of excellent, crisp and clear brightness. This product has been tested and validated for your Dell™ 3400MP Projector. It is supported by Dell™ Technical Support when used with a Dell projector