Option - Legacy Shaders

Good day!

As any beginner, I have questions, so I ask you to help me figure it out or indicate the direction I need to study.
Thank you in advance!

The wiki under “Deploying to Android” states:
Note: Armory will target gles3 by default. If you require gles2 support, enable Legacy Shaders option in Armory add-on preferences.

So if you set this option, then the light sources do not work. Is it the specifics of gles2, or the specifics of the engine, or did I not specify any settings?
And do I need to disable the enable option at all?

I believe my question is related to this post: HTML5, WebGL, and mobile phones (WIP)?