TG Daily writes a test of the power consumption of 3DTVs revealed power usage can swing dramatically when 3D mode is activated. It seems most TVs increase the brightness settings when switching from 2D to 3D, and this can cause an increased power consumption of 22 percent to over 50 percent. Only Sony's XBR-HX909 is an odd case, as this display somewhat dims when switched to 3D, which slightly lowers its power consumption.
Panasonic's TC-P50VT25 50-inch plasma used 160.91 watts in 2D mode and 260.53 watts in 3D mode, an increase of 38.24%.
Panasonic's TC-P65VT25 65-inch plasma used 176.84 watts in 2D mode and 354.71 watts in 3D mode, an increase of 50.15%.
Samsung's UN55C8000 55-inch LED used 118.73 watts in 2D mode and 152.89 watts in 3D mode, an increase of 22.34%.
The abnormal one was Sony's XBR-HX909 LED TV, which used less power than any of the other TVs in any mode, only clocked in at 106.66 watts in 2D mode and 104.65 watts in 3D mode, a decrease of 1.92%.