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according to the Optoma web site, it is a 2 year warranty. 90 days is on the lamp only. many DLP manufactures have less warranty on the lamps because people misuse them I guess. I have a 3 year old UHD50 (not 4K, 1080P) and though I use it about 35-40 hours a week, never had any issue with the original lamp. https://www.optoma.com/us/product/uhd51a/ look at the bottom of this page hope that helps
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