A very promising and exciting excerpt from Cine4home's initial review of the X70/90 (over the x7/9):
We start with the maximum brightness of the projector, which is achieved (as with its predecessor) with the color profile "Off" in Anwenderpreset in conjunction with the high lamp mode and minimum projection distance. Our light meter displays 1230 lumens, which is amazingly accurate indication of the work (1200 lumens). So far, the marketing division of JVC was already honest, but as we just explained, the brightness is only "worth anything" if it is accompanied with not-too-wrong colors.
And here are the first surprise (!) Was purchased during the previous generation, the maximum light output with the typical lack of red UHP lamp from almost 40%, it still scarce in X70/90 only 25%. The calibration to the standard demanded by video 6500K / D65 color temperature of costs with the new models so only 25% brightness & contrast (compared to 40%). Accordingly, the light was higher yield of the pre-series X90 after calibration: Around 930 lumens achieved this with accurate colors, which are about 20% more than the direct predecessor X7 (760 lumens) and still 10% more than the X3. Even in Eco mode (-25%), the X70/X90 virtually as bright as its predecessor in high lamp mode!
This gain was achieved solely through the optical color correction of the light path, without compromising the primary colors
I think someone is about come back again (thanks to Geof for finding this!)!