灯
トウ, ひ, ほ, ともしび, とも.す, あかり
lamp, a light, light, counter for lights
JLPT2 G4 S6 F1605
As per 丁# (straight) + 火 fire → *light* raised high, such as a torch → *lamp* (compare 主). In Japan, 灯 was also adopted as a Shinjitai (new character form) to replace 燈.
[Full Kanji Etymology List]