To my knowledge, no current presentation projector manufacture will guarantee that a projector will be defect free. Some will guarantee that a projector will contain less than a certain number of bad pixels. Some manufactures consider bad pixels close to the center of the image as a manufacturing defect that is covered under warranty. In some cases, the retailer will be more understanding of defects than the manufacture.
As such, the question of which projector model contains a given number or type of bad pixel is not as important as the policy of the manufacture and the retailer who sold the projector. Be sure to ask that question before and have it explained to your satisfaction before you purchase.
As such, the question of which projector model contains a given number or type of bad pixel is not as important as the policy of the manufacture and the retailer who sold the projector. Be sure to ask that question before and have it explained to your satisfaction before you purchase.