Fitilolin mota sun ƙare
Abubuwan tsarin lantarki na abin hawa suna fuskantar lalacewa a hankali a hankali. A wasu kwararan fitila, ana iya ganin alamun ci gaba na tsufa a saman kwan fitilar gilashi.
Lalacewar fitilun a hankali shine sakamakon matakan thermochemical da ke faruwa a cikinsu. Zaren a cikin kwararan fitila 
An yi su ne da tungsten, wani ƙarfe mai tsayin daka mai tsayin daka kusan digiri 3400 a ma'aunin celcius. A cikin kwan fitila na yau da kullun, nau'ikan atom ɗin ƙarfe ɗaya yana karye daga gare ta lokacin da filament ɗin ya kunna. Wannan al'amari na evaporation na tungsten atom yana haifar da filament a hankali ya rasa kauri, yana rage tasirin giciye. Bi da bi, tungsten atom da aka ware daga filament sun zauna a saman ciki na gilashin gilashin. A can sun samar da hazo, saboda abin da kwan fitila a hankali ya yi duhu. Wannan alama ce da ke nuna cewa zaren ya kusa ƙarewa. Zai fi kyau kada ku jira shi, kawai maye gurbin shi da sabon abu da zaran kun sami irin wannan kwan fitila.
Fitilar Halogen sun fi tsayi fiye da na al'ada, amma ba sa nuna alamun lalacewa. Don rage yawan ƙawancen ƙwayoyin tungsten daga filament, an cika su a ƙarƙashin matsin lamba tare da iskar gas da aka samu daga bromine. A lokacin ƙyalli na filament, matsa lamba a cikin flask yana ƙaruwa sau da yawa, wanda ke dagula rabewar atom na tungsten. Waɗanda ke ƙafe suna amsawa da iskar halogen. Sakamakon tungsten halides an sake ajiye su akan filament. Sakamakon haka, ajiya ba ta samuwa a saman tulun na ciki, wanda ke nuna cewa zaren ya kusa ƙarewa.
