灯 means “lamp, light”

とう · tou

Also: a light, counter for lights

Kun'yomi (Japanese reading)
ひ, ほ-, ともしび, ともす, あかり
On'yomi (Chinese reading)
トウ

JLPT N2 · Taught in grade 4 · 6 strokes

The story

Fire (火) beside a nail (丁): picture a flame fixed to a post. 灯台 is a lighthouse, but in the saying 灯台下暗し, dark at the lamp's foot, it is an old oil-lamp stand: what's closest is the hardest to see.

Used in 電灯 (dentou, electric light), 灯台 (toudai, lighthouse), and 灯油 (touyu, kerosene)

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Readings from KANJIDIC2, © EDRDG, CC BY-SA.