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These active 3D projectors work alternating the image between what your left eye sees and what your right eye sees. The glasses black out each eye in sync with the projector changing images. Your eye and brain average out the on/off brightness, so at best the image only looks 50% as bright as it would without 3D glasses. In reality, the synchronization can't be perfect, the on/off switch takes a small amount of time so each eye is off a little more than 50% of the time. So you will probably only get 30-40% of the brightness when watching 3D. If you measure the screen you won't see the difference, unless you measure it through the glasses. Even passive systems still lose over half the brightness, because the polarized lens cut out over 50% of the light.