Originally Posted by Joe_Black
There's many ways to overstate lumens on specs and technically be telling the truth.
Here's an example.
Sanyo specs their Z2000 at 1200 lumens on paper (in Dynamic mode, lamp on high, lens at shortest throw wide angle)
I approach Sanyo and ask them to private brand the same Z2000 projector under 'JoeBlack' brand as model JB-XV2000 using the exact same hardware and 165W bulb. For the Dynamic preset I pump up green and some blue, raise the gamma until I hit 1500 lumens and have Sanyo send it into production like that.
When I bring it to market, I can actualy release a spec sheet that states 1500 lumens and make my projector appear to be brighter than the Sanyo. When a reviewer like PC or PR sets my XV2000 to Dynamic they'll measure and confirm 1500 lumens.
Sanyo Z2000 165W bulb, D7 lcd, 1200 lumens
JoeBlack XV2000 165W bulb,D7 lcd, 1500 lumens
If you looked at the above specs you should be thinking the JB-XV2000 is much brighter, but in fact your actually buying the exact same projector as the Sanyo.
All I'm saying is both the AE2000 and Z2000 share the same 165W bulb and D7 panels, their relative modes when equally calibrated and will be more the same than different.
That is probably pretty close to the truth, but it is assume all other components are equal. In this case, they are different.
Assume one has light leaks and one is perfect, shooting all light through the lens. that will be brighter.
Also, one could have better glass, which could affect brightness.
Finally, and please correct me if I'm wrong, but the same wattage lamp only means that the CAN put out the same amount of light...not that they do. Perhaps the panasonic puts more power to the lamp where the sanyo doesn't. One example of what i'm thinking about is the Eco mode that these projectors have that restrict the amount of power and hence the brightness, from the bulb.
Even still, those differences would be very small, which is why your example is very credible.
the difference, in my opinon, is the light output when used in a real enviornment.
If the panasonic's optical iris really works well, I could have a much brighter picture than with the sanyo, for instance, if the sanyo doesn't have that iris (which i've been confused about. I think, from the cine4home preveiws that the panasonic has an optical iris that operates on a per frame basis, where the sanyo iris is only at the bulb and not quite as functional).
Unless I'm missing something, there could be, even when calibrated, be a very real difference in brightness, even without taking the software and processing into account.