clear
晄 centers on brightness and clarity, like sunlight making everything visible and distinct.
晄 combines 日 (sun) with 光 (light), reinforcing the idea of bright sunlight or clarity.
The sun 日 and light 光 together make a scene of brilliant clarity: 晄 is clear and bright.
For コウ, imagine a clear, bright coat of sunlight: coat -> コウ, and the sun 日 plus light 光 make everything clear.