Ana amfani da dumama masana'antu na lantarki a matakai daban-daban inda ake buƙatar ƙara yawan zafin jiki na abu ko tsari.Misali, man mai mai mai yana buƙatar dumama kafin a kai shi ga injina, ko kuma, bututu na iya buƙatar yin amfani da injin tef don hana shi daskarewa a cikin sanyi.