訓 ひ,ほ-,ともしび,とも(す),あかり ・ 音 トウ
Sino-Vietnamese: đăng
The fire radical 火 gives the meaning and 丁 the sound: a burning flame for light. Sino-Vietnamese đăng, as in hải đăng (lighthouse).
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部屋の灯りをつけた。 (へやのあかりをつけた)
I turned on the light in the room.