Light Bright Shine in Chinese / Japanese...

光 is the simplest way to express “light” in Chinese, Japanese Kanji, and old Korean Hanja.

It can also mean ray or bright. Chinese tend to use a two-character word for light/bright, so this character is probably best if your audience is Japanese. Also, when pronounced Rei, this can be a Japanese female given name.

In the Zen Buddhist context, this is the pure light that everyone possesses at their origin.