Originally Posted by joechuan
Hello everybody, I have come down to these two and have poured over hundreds of threads. There is one concept that I don't quite understand and may be the deciding factor--calibrated lumens in normal viewing mode. Everybody says that the Epson is the brighter projector, but the JVC has more calibrated lumens--what is the practical application of that?
I can't comment on the projectors, but I can comment on what that "means".
If you really back this up an oversimplify it, projection lamps have an abundance of Blue and Green, and generally a deficit of red, the ratio of these three colors determines the "color temperature". "Out of the box" projectors are generally far too blue, and need to have blue and green reduced to match the red capabilities of the projector. At a high level, you can think of "calibrated" to mean red, blue and green are brought into their proper relationship to make white, which usually means reducing blue and green, and thus reducing overall brightness. For business projectors, this doesn't really matter so they generally come setup for max brightness regardless of color temperature, where as for home theater you want them to be precisely calibrated to the standards (otherwise people can look sunburned for example) To continue my overgeneralization, projectors with more of a business projector heritage tend to have modes built in that have very high color temperatures that they've inherited from their business brethren. While projectors with out the business influence tend to come closer.
Essentially, projectors "out of the box" are varying degrees from "calibrated". So to answer your question about what the practical application of "calibrated lumens" is, well, essentially it's the only brightness number you should care about. The "ANSI Lumens" spec on the projector is meaningless, it's basically the brightest the projector can go regardless of color temperature/image quality. For one projector, say a business projector, that number might be with a white that looks very blue, where as with another projector, for example my Planar 8150, it could be essentially a calibrated value.
Basically "calibrated lumens" is the only apples to apples comparison of brightness. Or to put it simply if we assume an Epson 6010 produces fewer "calibrated lumsns" than a JVC RS45, then when you get the projector home and set it up to produce the best picture for your home theater, the JVC will be brighter (I don't know if that's accurate or not, I'm just going on the statement in the OP).