Illumination items: It´s small, but it does its job

Six hundred dollars a kilowatt-hour! Sounds like the cost of energy at the North Pole, yet that is the cost of the energy consumed by a vestpocket flashlight. This seems rather extravagant when compared with the central station rate for this same kilowatt hour. It is not excessive, however, because the tiny flashlight lamp uses such a small fraction of a kilowatt, so small in fact that the lamp will burn for 2000 hours on a single kilowatt-hour of energy. And as for results, the comfort, convenience and safety of a ready flashlight are worth much more than their actual cost.