Job 37:15 - Ellicott's Commentary On The Whole Bible

Light of His cloud — i.e., lightning, as before. “Dost thou know all the secrets of God’s thunderbolts, at whom and how He will use them?” Some understand this otherwise: “Dost thou know when God setteth the sun over them (the clouds), and causeth the light (i.e., the sun) to shine upon His cloud?” i.e., “Dost thou know how God useth the sun to disperse the clouds?”