His candle, i.e. his favour and blessing, oft signified by the name light; as his displeasure and a state of affliction is frequently called darkness. Upon my head, or, over my head, to comfort and direct me. The ground of the expression is this, that lights used to be carried and set on high, that men may make the better use of them, as the sun for that end was placed above us. I walked through darkness; I passed safely through many difficulties, and dangers, and common calamities, which befell others who lived round about me, and overcame those troubles which fell upon myself.
Related Commentaries of Job 29:3
Job 29:3
3 When his candleb shined upon my head, and when by his light I walked through darkness;