discharge lamp
Technical term for a lamp that produces light by an electric discharge through a gas or vapor.
蛍光灯は放電灯の一種です。
Fluorescent lamps are a type of discharge lamp.
蛍光灯 is a specific type of discharge lamp (fluorescent lamp), while 放電灯 is the broader category.
Compound of 放電 (discharge) and 灯 (lamp).