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因水力机械模型试验中无法满足代表粘性力相似的雷诺准则，只规定了雷诺数最小值，远小于真机雷诺数，因此使模型和真机中各项损失值产生差异，故必须进行效率换算。近年来国际上对其换算公式进行了修正，用ＩＥＣ９９５（１９９１）规定代替原ＩＥＣ１９３（１９６５）。灯泡贯流式水轮机（以下简称灯泡机组）的效率换算亦应采用国际上推荐的新公式。
Because the Reynolds criterion that represents the similar viscous force can not be satisfied in hydraulic machinery model test, it only stipulates the minimum Reynolds number, which is much smaller than the Reynolds number of the real machine. Therefore, the difference between the loss value in the model and the real machine is different, so the efficiency conversion . In recent years, the international conversion formula was amended with IEC995 (1991) to replace the original IEC193 (1965). Bulb turbine (hereinafter referred to as the bulb unit) conversion of efficiency should also be internationally recommended new formula.