ANSI C78.375A-2014 describes the procedures to be followed and the precautions to be observed in obtaining uniform and reproducible measurements of the electrical characteristics of fluorescent lamps under standard conditions when operated on alternating current (ac) circuits. These methods are applicable both to lamps having hot cathodes-switch-start (preheat-start), rapid-start (continuously heated cathodes), or instant-start- and to lamps of the cold-cathode variety.