Confining LEDs to the edges of an LCD TV cuts its energy consumption, particularly if you can get away with just lighting up one or two edges instead of all four. LG claims its latest Full HD 47-inch panel is the "world's most energy efficient," using a single vertical edge backlight to achieve 400 nits of brightness with just 28W of power -- less than any other HDTV bigger than 40-inches and even less than many 20-inch PC monitors. That's all good so long as there's no head-lig
