Plasma TV with Low Power Modes

A plasma TV produced by Mitsubishi and reviewed by Ultimate AV has a remote that has buttons to put it into both a standby mode and a sleep mode. It is not clear what the difference is between the modes, or what their energy use is, but the review seems to indicate that the low power modes are designed to help reduce burn in problems. However, I wonder if manufacturers are also beginning to be sensitive to the public perception of the high power use of plasma screens.