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 150-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.