Version: 2018.3 (switch to 2019.1 )
Legacy Deferred Lighting Rendering Path
Hardware Requirements for Unity's Graphics Features
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Vertex Lit Rendering Path Details

This page describes details of Vertex Lit rendering pathThe technique Unity uses to render graphics. Choosing a different path affects the performance of your game, and how lighting and shading are calculated. Some paths are more suited to different platforms and hardware than others. More info
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Vertex Lit path generally renders each object in one pass, with lighting from all lights calculated for each vertex.

It’s the fastest renderingThe process of drawing graphics to the screen (or to a render texture). By default, the main camera in Unity renders its view to the screen. More info
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path and has the widest hardware support.

Since all lighting is calculated at the vertex level, this rendering path does not support most per-pixel effects: shadows, normal mapping, light cookies, and highly detailed specular highlights are not supported.