How to say “This lamp is economical to use.” in JapaneseIn Japaneseこのランプは電気代(でんきだい)が安(やす)くて経済的(けいざいてき)です。Kono ranpu wa denkidai ga yasukute keizaiteki desu.▶ Hear it in JapaneseThis lamp is economical to use. in other languagesWhat This lamp is economical to use. meansIn PortugueseIn French