• 灯台とうだい — lighthouse
• 灯油とうゆ — kerosene
• 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
• 提灯ちょうちん — paper lantern

The radical 火 (fire) plus 丁 (phonetic element) formed the character 灯, symbolizing a small controlled flame. It evolved to mean “lamp” or “light source” and is often used in compounds describing artificial illumination, such as lighthouses or street lamps.