The written warranty is the only expectation that anyone should ever have. Specifications have all sorts or legal disclaimers. JCCs last year came with a 90 day bulb warranty because that is the warranty the bulb manufacturer provided JVC. Exactly what theat warranty means is somewhat unclear. If the bulb goes dark, explodes, has a cow whatever within 90 days of the sale of the projector you legally have the right to have JVC supply you a new bulb. If the bulb goes 35% dimmer than initial turn on before 90 days you would expect to have no legal rights. Things get a little less clear if the bulb dims by 50% before 90 days because 50% dimming is in the industry looked at as the end of a bulbs life. I suspect legally you would have a right to get a new bulb if it dimmed by 50% before 90 days. Bulb hour specs are meaningless. If a bulb is rated as having a 1/2 power life of 2000 hours, let's call it a half life of 2000 hours, you are SOL if the bulb reaches half its rated output at day 91. Suppose 90% of bulbs last 2000, and you as an unlucky bastard only got 500 hours before it dimned to 50%, you have absolutely no rights if that happens after 90 days. Why? Your warranty was 90 days. It wasn't 2000 hours of use. It wasn't any hours of use. It was 90 days even if you never turned the projector on. The spec is 2000 or 3000 or whatever BUT that gives you no right nor remedy, your warranty was 90 days.
Now companies like to keep customers happy. And when a ;large number of bulb dimming issues occur early in a lamps life but say exceeding 90 days, the manufacturer as good will will replace the lamp for free. Does it cost them much to do that. No. Because they simply make a claim with the bulb manufacturer claiming failure within 90 days. No number of days meter built into a bulb. Can't even tell how long it was run.
To my knowledge, JVC as good will gave most who asked claiming low hour failures or severe low hour dimming a new lamp regardless of the days Dimming of the replacement lamp, if one got 400 or 500 hours when added to the first of say 400 or 500 hours, They don't warrant lamp life by the hours. They don't warrant meeting all specs. It becomes an adhominium determination depending on good will. Now you are scream on the internet and that is perhaps not a bad tactic because they might give you a free lamp to shut you up.
But given that anyone can scream for free on the internet, manufacturers are tightening up on buying off screamers.
It will be interesting to see what the written warranty will be for the bulbs this year. It will be interesting to see how the warranty is written It would be nice for a one year but then exactly what does that mean. It stil lights for a year. How bright. If its above 50% thenn its OK. If its a one year or 1000 hours, whatever comes first, they have no clue that you ran 2000 hours but tell them 999. And then what amount of dimming with the first year or 1000 hoursmeets their standard. What is there standard.
Last year it was 90 days without anything specified. Remember the specs are not part of the warranty because of those disclaimers. Sometimes they or some of them can be but even then specs offer in warranty term means standards of work
My bottom line, once they give you enough bulbs to exceed 1000 hours at over 50% rated output, you are unlikely to get a free bulb. But you a doing the best thing. screaming loud and angry and maybe they will be scream mailed into shutting you up.