The cells the men and women are 'housed' in range in size from 5x8 feet to 8x15 feet. Roughly the same size as the average North American household's bathroom. There is no other furniture in the cells, though some states have concrete shelves on the cell's back walls - to serve as 'tables,' or a place to set a TV or radio if the prisoner is so fortunate as to have one. The walls are concrete, often unpainted. In most states, the prisoners are not allowed to tack anything to their walls.
Lighting is via flourescent tubing or bare bulbs.
However, when Amnesty International's delegates turned off the electric light in a cell during the middle of what was a very sunny day, there were in almost total darkness with a little light reaching no more than a foot or so inside the door. All meals are eaten in the cell. Given the close proximity of these living arrangements, there are some valid health-hazard concerns. There is no natuaral fresh air ventilation to the cell units. Some units have some form of air-conditioning, many don't.