Blue room

[sabrinah]

Why, when you walk past someone's house at night - and they're watching TV - is the room lit up blue?

[Ed Ancona]

Most color television receivers have their screen adjusted to a color balance near that of daylight, which would be scientifically described as a color temperature of about 6000 degrees Kelvin. Ordinary incandescent lamps are much warmer or yellower at less than 3000 degrees. At night your eyes would be adapted to the prevailing incandescent street lamps or automobile headlamps. Thus, the interior of a house with a TV on iz illuminated with a light bluer than that to which your eyes are adapted. The house residents have their eyes adapted to the TV set color and do not see it as blue.