Concise Bible Dictionary:

Used in the Old Testament for any light either real or symbolical. Job said of God, “when his candle shined upon my head”(Job 29:3); “the candle of the wicked shall be put out” (Prov. 24:20); whereas respecting “the wise woman” it is said “her candle goeth not out by night” (Prov. 31:18). God will search Jerusalem with candles (Zeph. 1:12). In the New Testament the word signifies a lamp, and in some passages is typical of the testimony of God, which should be manifested in those receiving it, and should not be hidden (Luke 8:16; Luke 11:33, 36). In the holy Jerusalem there will be no need of the candle of earthly light, for the Lord God shall shine upon them (Rev. 22:5). The modern “candle” was not known in scripture times.