In order to achieve the required illumination on a plane and meet the requirements of a lighting system, it is necessary to do the secondary design for optics system.

为在平面上实现所需的照明，满足照明系统的要求，需要对光学系统进行二次设计。

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The child-free area, called the "Quiet Zone, " has softer lighting and is sectioned off from the rest of the plane by toilets and bulkheads, the theory being you won't be able to hear the kids who are toward the back of the plane.

CNN: Kid-free 'Quiet Zones' launched on airline