Diffractive efficiency of Fresnel lens is important factor to evaluate the quality of Fresnel lens.

菲涅耳透镜的衍射效率是评价菲涅耳透镜质量的一个重要指标。

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Four kinds of laser source are used to measure the diffractive efficiency of Fresnel lens.

使用四种不同光源，对菲涅耳透镜的衍射效率进行测试。

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Surface mount LED lamp. High efficiency red, super bright green. Lens type water clear.

表面贴装LED灯。效率高红，超明亮的绿色。镜头类型，水质清澈。

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One looks through the lens of efficiency and another through the lens of fairness.

FORBES: We Won't Get Ahead By Taxing Warren Buffett More -- Jennifer Aniston, Maybe

In a recent interview, Graf laid out four stages that most companies move through as they use sustainability principles as a lens to better understand operations and improve efficiency and productivity.

FORBES: Four Steps to Improving Profits through Sustainability