手電筒：（英文：Flashlight或Torch），簡稱電筒，是一種手持式電子照明工具。一個典型的手電筒有一個經由電池供電的燈泡和聚焦反射鏡，并有供手持用的手把式外殼。雖然是相當簡單的設計，它一直遲(chi)至19世紀末期(qi)才被發明(ming)，因(yin)為它必須結合電(dian)池(chi)與電(dian)燈泡(pao)的發明(ming)。在早期(qi)因(yin)為電(dian)池(chi)的蓄(xu)電(dian)力不足，因(yin)此在英文中它被稱(cheng)為"Flashlight"，意即短暫的燈。

雖然說現(xian)在手(shou)(shou)(shou)機(ji)都有自帶(dai)手(shou)(shou)(shou)電(dian)(dian)筒的功(gong)能(neng)，但是，夜晚(wan)，家(jia)里(li)停電(dian)(dian)了或者出行時，手(shou)(shou)(shou)機(ji)也沒電(dian)(dian)，手(shou)(shou)(shou)電(dian)(dian)筒可(ke)派上大用(yong)場了。隨著(zhu)手(shou)(shou)(shou)電(dian)(dian)筒技(ji)術(shu)的發展，家(jia)用(yong)手(shou)(shou)(shou)電(dian)(dian)有壽命長(chang)、可(ke)靠(kao)(kao)耐用、維護費用極(ji)為低的(de)(de)特(te)點(dian)。采用恒壓驅(qu)動(dong)保(bao)證強光手電(dian)筒(tong)亮度的(de)(de)一致性(xing)(xing)，保(bao)證LED手電(dian)筒(tong)的(de)(de)可(ke)靠(kao)(kao)性(xing)(xing)、壽命和(he)光衰。采用低成本、高可(ke)靠(kao)(kao)性(xing)(xing)的(de)(de)驅(qu)動(dong)電(dian)路(lu)才是保(bao)證超手電(dian)筒(tong)有(you)持久亮度的(de)(de)關(guan)鍵，所(suo)以我(wo)們在選(xuan)購(gou)家(jia)用手電(dian)筒(tong)也需(xu)要格外細心。