Optical efficiency is the main factor which influences the energy efficiency.
光学效率是影响能量效率的主要因素。
Efficient distribution of light, optical uniformity and a high optical efficiency.
高效配光技术，光均匀度及出光效率高。
Optical efficiency is one of the key problems in design of this kind of solar water heaters.
光学效率是这类热水器设计的关键问题之一。
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