head torch       
noun [ C ] UK uk/ˈhed ˌtɔːtʃ/ us/ˈhed ˌtɔːrtʃ/ (US headlamp, /ˈhed.læmp/ /ˈhed.læmp/)
 (矿工等用的)头灯,额灯,帽灯
a light worn on the head, for example when going under the ground
  He was wearing a miner's helmet with a head torch. 他戴着一顶装有头灯的矿工安全帽。 
 All they could see was his head torch shining in the darkness. 他们只能看到他的头上的灯在黑暗中发光。 
 - More examples
 - By the light from our head torches we examine the wound.
 - Competitors will be walking through the night, so a head torch is a must.
 - The batteries in her head torch had run out.