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.

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交流220v LED防爆灯，有发光效率高、奉命长、绿色环保等优点，已广泛用危险区照明及住宅小区、学校、医院、公共场所照明。

Exchange 220v LED lamp, have high luminous efficiency, long, green and was already widely used gas-masks advantages, lighting and residential areas, schools, hospitals, public lighting.

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并且其发光效率比普通荧光灯提高了30%，约为白炽灯的5倍。

And its luminous efficiency than ordinary fluorescent lamps increased by 30%, about 5 times the incandescent lamp.

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