由灯丝封装在玻璃里而制成白炽灯，只有5%的能量被用于发光；其余都以热能被浪费掉了。
An incandescent bulb, made of a wire filament encased in glass, emits only 5% of the energy it consumes as light; the rest is wasted as heat.
这款灯的外形与传统白炽灯相同，它使用单片灯丝，功率为4. 4瓦，寿命长达4万小时。
The light shape and the traditional incandescent lamp, it USES single filament, power of 4.4 watts, a service life of 40000 hours.
这款灯的外形与传统白炽灯相同，它使用单片灯丝，功率为4. 4瓦，寿命长达4万小时。
The light shape and the traditional incandescent lamp, it USES single filament, power of 4.4 watts, a service life of 40000 hours.
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