• 灯ひ — light, flame
• 灯台とうだい — lighthouse
• 点灯てんとう — lighting, turning on a light
• 消灯しょうとう — lights out
• 街灯がいとう — street lamp

Combining the radical 火 (fire) with the phonetic 丁 (ちょう), the kanji 灯 originally referred to a flame or light source. It’s frequently used in compound words describing artificial lights like lamps, lanterns, and lighthouses.

街灯がいとうが 道みちを照てらしている。
The streetlights are illuminating the road.

灯台とうだいは 夜よるの海うみを照てらす。
The lighthouse lights up the sea at night.

部屋へやの灯ひを消けして寝ねました。
I turned off the light and went to sleep.

🎧 On-yomi トウ is often used in compound words like 灯台 (lighthouse) and 街灯 (streetlight). The kun-yomi ひ appears when referring to a flame or light in a more general or poetic sense.