Zombie when I looked some time ago for that old BenQ brochure online and could not find it. I got a printed version at the ISE show, when the projector with BenQ's own hybrid LASER/Phosphor engine was launched. 20K hours, but it was an short throw WXGA projector aimed at the classroom market,i.e. light rooms that need all the lumens, so at the 2000 initial lumens setting, not the 1000 initial lumens that the marketing people say should last 20K hours. But that is to 50% output, i.e. 500 lumens if one is lucky. Take 10K hours and follow the curve it 70% was around 6K hours if I remember correctly, i.e. replace the unit at least every three years, perhaps quicker. The Panasonic 3500 initial lumens engine in the rz-370/470 and wxga models curve was still online a few weeks ago.
LED has 5% or 10% drop-off after 20K hours.
Last edited by donaldk; 09-04-2014 at 10:56 AM.