I have some back lighting LED strips that I took out of some dead HDTV's, I powered them up and ran for the sunglasses, they lit up the whole house, (64 LED's on one strip) running two of them on 12 volts DC is blinding, but three in series at about 14 volts is comfortable to look at without welding goggles on.
As back lighting for an HDTV these run 16 LED's in series in groups of four at 100 volts DC per group, the combined light will light up a large back yard with a brilliant white light, bright enough for a book reading club party.
They get quite warm so you have to leave them on the large flat aluminum plate that acts as a heat sink, this is why some don't need the heat on in the TV room, a 55 inch LED HDTV will keep it quite warm enough.
And you guys want to talk about cold houses, the cave I grew up in had problems when the snow piled up against the walls, even with storm windows on you still needed to sleep with the largest Dog you could find as my older Brothers always swiped the blankets, the coldest winter I remember was -70 below zero F, (-56 C to you all) and that was without the wind blowing, you had to boil some water just to flush the toilet.
The bad thing was you had to walk 5 miles to School, up hill in the snow both ways, the Earth was a lot warmer just before the last ice Age, so you didn't have to worry as much about the cold.
