The two images below demonstrate the differences in brightness between the calibrated "best" mode, and brightest mode. Both images were taken with the same exposure, so you can see the difference, and also the different (cooler) colors of the High Brightness mode.
Bottom line: The lack of lots of lumens, especially in brightest mode makes the HC7000 projector a projector that best serves those with smaller screens and those who really care about movie viewing but are not concerned about the extra lumens needed for watching other things with some ambient light.
Dropping the lamp to eco-mode (low power), we measured a 26% drop in lumens. We tested in Medium mode, but that percentage drop should be about the same regardless of mode.
The HC7000 measures 11 percent brighter in full wide angle zoom, and 16 percent dimmer when in full tele-photo zoom. These differences are smaller than you may have read about from other competing 3LCD projectors. That is due to the more modest, 1.6.1 zoom range of the HC7000.