noun
cap lamp; headlamp (for a hard hat)
A small lamp attached to a helmet or cap, used especially in mining, caving, or industrial work.
炭鉱作業員はキャップランプをヘルメットに取り付けて坑道に入った。
The coal miner attached a cap lamp to his helmet and entered the tunnel.
Variant with a middle dot, sometimes seen in technical or catalog contexts.
ヘッドランプ is a broader term for any head-mounted light, including outdoor sports and general use, while キャップランプ specifically refers to a lamp attached to a hard hat or cap, often in industrial settings.
Loanword from English 'cap lamp'.