Ofishin hasken wuta na 6 watt led bulb e27, ta amfani da babban guntu da guntu da direban jagoranci na yau da kullun, duk kwararan fitila suna ƙarƙashin babban ƙarfin lantarki da gwajin tsufa mai ƙarancin ƙarfi, farashin gasa ne, fitarwa zuwa ƙasashe sama da 30 na duniya. Duk farashin tsoffin masana’antar China ne. Maraba don bincike.