Akwai nau’ikan fitilun kashe gobara da yawa, daga cikinsu na’urar gano hayaki ta photoelectric, lokacin da hayaƙin wuta ya kare laser, wutar lantarki ta rasa ƙarfi kuma tana aika siginar ƙararrawa. Hasken faɗakarwar wuta zai haskaka ja da tabo don sanar da mutane cewa gobara ta tashi kuma dole ne su gudu.