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(ta)一(yi)直遲至19世紀末期才被發明，因為(wei)它(ta)必須結合電(dian)(dian)池與電(dian)(dian)燈(deng)泡的(de)(de)發明。在早期因為(wei)電(dian)(dian)池的(de)(de)蓄(xu)電(dian)(dian)力不足，因此(ci)在英文(wen)中(zhong)它(ta)被稱為(wei)"Flashlight"，意即短暫的(de)(de)燈(deng)。

雖然(ran)說現在手(shou)(shou)機(ji)都有自帶手(shou)(shou)電(dian)(dian)筒的功(gong)能，但是，夜晚，家里停電(dian)(dian)了或者(zhe)出行時(shi)，手(shou)(shou)機(ji)也沒電(dian)(dian)，手(shou)(shou)電(dian)(dian)筒可派上大用(yong)(yong)場了。隨(sui)著手(shou)(shou)電(dian)(dian)筒技術的發(fa)展，家用(yong)(yong)手(shou)(shou)電(dian)(dian)有壽命(ming)長(chang)、可靠(kao)耐用(yong)(yong)、維(wei)護費用(yong)(yong)極為低的(de)(de)特點(dian)。采用(yong)(yong)恒壓(ya)驅(qu)動保(bao)(bao)證強光手(shou)(shou)電(dian)(dian)筒(tong)亮度(du)的(de)(de)一(yi)致性，保(bao)(bao)證LED手(shou)(shou)電(dian)(dian)筒(tong)的(de)(de)可靠(kao)性、壽命和光衰(shuai)。采用(yong)(yong)低成本、高可靠(kao)性的(de)(de)驅(qu)動電(dian)(dian)路(lu)才是保(bao)(bao)證超手(shou)(shou)電(dian)(dian)筒(tong)有持(chi)久亮度(du)的(de)(de)關鍵，所以我(wo)們在選購家用(yong)(yong)手(shou)(shou)電(dian)(dian)筒(tong)也(ye)需要格外細心。