noun
naked light bulb; bare light bulb
Refers to a light bulb without a shade or cover, often used in descriptions of simple or stark lighting.
部屋には裸電球が一つぶら下がっていた。
A single bare light bulb hung in the room.
Compound of 裸 (はだか, 'naked') and 電球 (でんきゅう, 'light bulb').