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What are the different functions of light guide plate and diffusion plate of LED panel lamp? How big is the price gap between Gaoding and Mitsubishi on the light guide plate?
Light guide plate is generally used for side-entry module, which converts side line light source into surface light source.

Diffuser is generally used for direct-type modules to atomize and soften the bottom light source.

The diffusion plate has a certain haze, and the light guide plate needs optical design.