Excerpt from Guide to the Selection and Testing of Incandescent Lamps
Central stations are in the business of making and selling light. They may sell by the ampere hour, the watt hour, the lamp hour, or by contract, but regardless of the way it is measured, the customer is in... reality buy ing and using light. Since the lamp transforms the electrical energy of the generators into light, the best lamp is an absolute necessity to obtain the best light. It is, then, almost a self-evident truth that the exclusive use of the best lamp is the only means of obtaining the best results.
The exclusive use of the best lamp involves two condi tions.
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