A simple explanation of Philips ìAmbilight 4" technology based on the new 42 ìFull Surround" LCD from Philips now with four lights, one on each side. The system offers variable backlight, where color changes are based on the picture on the screen going from white to red to other colors. You get blacker blacks on the screen and the concept makes it easier on the eyes, except when you are really tired, then the only solution is to turn off the TV & go to bed.