虽然白炽灯的发光效率极限是每瓦52流明，然而这钨丝在其熔点的理论亮度。
While the upper limit for incandescent lamps is 52 lumens per watt, that is the theoretical luminosity of tungsten at its melting point.
一盏白炽灯所能达到的最高温度——即最大亮度——是其钨丝熔点的温度。
The highest temperature-and thus the brightest light-that an incandescent lamp can achieve is the melting point of its tungsten filament.
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