clear
晃 centers on bright, clear light: something shining and unobstructed, like sunlight that makes everything distinct and visible.
晃 combines 日 (sun) and 光 (light), two elements that together emphasize brightness and clarity. The structure suggests the sun's light shining clearly.
The sun 日 sits above 光 (light), like sunlight pouring down and making everything clear and bright.
For コウ, imagine a clear, bright light shining like a 光 (こう) beam: 光 -> コウ, and the sun above makes it even clearer.