What's the advantages of backlit panel light compared with edge-lit panel light?

So far, edge-lit LED panel light is dominant panel light type in the market. Things gonna be changed. with the development of light performance, the backlit panel light could be the most popular panel light.

Why? Below are advantages of backlit panel light compared with edge lit panel light. Firstly the diffuser will not turn yellow. The LED chips are tightly close to LGP in edge lit model. This makes the lighting surface easily to be yellow after 2 or 3 years, especially for bad quality LGP. while in backlit panel, there are no LGP and there is distance between LED chips and diffuser. So the lighting surface of backlit model will not turn yellow easily as edge lite panel light. Secondly, the backlit panel has better light efficiency.In edge-lit models the LED chips are arranged on the inner edge of the luminaire. The light is then bounced downwards through LGP ( light guide plate) and diffuser. While in the backlit model,LED chips are arranged on the back board, the light across through diffuser directly.So the backlit panel has more luminous output.Thirdly, the backlit panel cost less on materials and labors.