Replacement Lamp Cost: Unknown.

更换灯泡费用：未知。

youdao

And the replacement lamp cost is much higher than the competition.

和更换灯泡的成本远远高于竞争。

youdao

Even though you save on kerosene, it takes more than three years after purchase for the total cost of running a compact fluorescent lamp to drop below that of a kerosene lamp and fuel.

如果不用煤油灯，节省下来的灯油钱，要三年才抵得上购买一个紧凑型灯的花费。

youdao

But it indicates a demand (the majority of backers invested at a level which would get them a lamp, at a cost well over the average Kickstarter donation), and could yet be parlayed into the future development plans of the right kind of product.

FORBES: Kickstarting Over - Good Night Lamp's Kick-Smart Response

This improves reliability, and centralising the solar charging reduces the cost of each lamp.

ECONOMIST: Solar lighting

The group sets a small percentage of the cost of each lamp to go toward the volunteers.

CNN: 'Saving lives' with solar-powered lights