noun
small light; miniature lamp
Rare term; usually replaced by 豆電球 (miniature bulb) in modern usage. Refers to a small electric light, often a flashlight bulb or indicator lamp.
See also: 豆電球
豆電灯は、豆電球を使った小さな照明器具を指すことがある。
豆電灯 can refer to a small lighting fixture that uses a miniature bulb.
Common modern term for a miniature light bulb. 豆電灯 is rarer and may imply a complete small lamp rather than just the bulb.
Compound of 豆 (mame, 'bean', here meaning 'miniature') and 電灯 (dentō, 'electric light'). The exact origin is uncertain, but it follows a common pattern for small-sized items.