Guang in Chinese / Japanese...

広 is the Japanese variant of 廣 (from Chinese).

The original meaning is wide, numerous, or to spread out. However, in modern Japan, this is used primarily as a given name. Most often it is romanized as Hiro.

This Kanji can also romanize as the names Yutaka, Hiromu, Hiromatsu, Hirotsugu, Hirosue, Hiroji, Hiroshi, Hirosaki, Hirokatsu, Kouji, or Kou.

In Chinese, this would romanize as guǎng where it still holds the original meaning and is a common Chinese surname. However, this 広 version is strictly Japanese, and most Chinese will not realize it’s a variant of 廣. This will be true especially in the mainland where the Simplified Chinese is now written as 广.

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.

世光 means “light of the world” in a Buddhist context in Chinese and Japanese.

This can also be the personal name Toshimitsu in Japanese.

時光 is a Chinese and Japanese word that means time, era, period of time, etc.

時光 is used as part of other words like “time machine” (時光機) or “happy time” (歡樂時光) (happy hour) in bars.

This can also be a surname or given name, Tokimitsu, in Japan.