I purchased a $189.00 projector bulb from Projectorquest that was guaranteed to replace the original bulb. The original bulb lasted over 4 years, theirs last less than 6 months. Since I was over their 6 month warranty by weeks, due only to date of purchase, not use of product, they would only give me $10 off coupon. Talked to multiple people in the company until I could go no higher with no help given.